00100 - Statement - CONSOLIDATED BALANCE SHEETSlink:presentationLinklink:calculationLinklink:definitionLink00200 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONSlink:presentationLinklink:calculationLinklink:definitionLink00300 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSSlink:presentationLinklink:calculationLinklink:definitionLink00400 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWSlink:presentationLinklink:calculationLinklink:definitionLink40402 - Disclosure - INVESTMENTS (Summary of Unrealized Positions for Held-to-Maturity Debt Securities) (Details)link:presentationLinklink:calculationLinklink:definitionLink40403 - Disclosure - INVESTMENTS (Summary of Held-to-Maturity Debt Securities by Contractual Maturity) (Details)link:presentationLinklink:calculationLinklink:definitionLink40501 - Disclosure - INVENTORIES (Components of Inventories) (Details)link:presentationLinklink:calculationLinklink:definitionLink40702 - Disclosure - EQUIPMENT AND LEASEHOLD IMPROVEMENTS (Summary of Major Categories of Equipment and Leasehold Improvements) (Details)link:presentationLinklink:calculationLinklink:definitionLink40802 - Disclosure - INCOME TAXES (Components Of Income Tax Expense) (Details)link:presentationLinklink:calculationLinklink:definitionLink40804 - Disclosure - INCOME TAXES (Effective Income Tax Rate Reconciliation) (Details)link:presentationLinklink:calculationLinklink:definitionLink40805 - Disclosure - INCOME TAXES (Schedule of Deferred Income Tax Assets and Liabilities) (Details)link:presentationLinklink:calculationLinklink:definitionLink41001 - Disclosure - ACCRUED LIABILITIES (Schedule of Accrued Liabilities) (Details)link:presentationLinklink:calculationLinklink:definitionLink41201 - Disclosure - LOSS PER COMMON SHARE (Reconciliation of Numerator and Denominator Used to Calculate Basic and Diluted Income (Loss) per Share) (Details)link:presentationLinklink:calculationLinklink:definitionLink41503 - Disclosure - LEASES (Future Minimum Lease Payments) (Details)link:presentationLinklink:calculationLinklink:definitionLink41902 - Disclosure - SEGMENT INFORMATION (Summary of Segment Information) (Details)link:presentationLinklink:calculationLinklink:definitionLink00500 - Statement - CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITYlink:presentationLinklink:calculationLinklink:definitionLink40101 - Disclosure - DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)link:presentationLinklink:calculationLinklink:definitionLink40102 - Disclosure - DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative II) (Details)link:presentationLinklink:calculationLinklink:definitionLink40301 - Disclosure - REVENUE RECOGNITION (Narrative) (Details)link:presentationLinklink:calculationLinklink:definitionLink40302 - Disclosure - REVENUE RECOGNITION (Disaggregation of Revenue) (Details)link:presentationLinklink:calculationLinklink:definitionLink40801 - Disclosure - INCOME TAXES (Narrative) (Details)link:presentationLinklink:calculationLinklink:definitionLink40901 - Disclosure - CREDIT FACILITY (Narrative) (Details)link:presentationLinklink:calculationLinklink:definitionLink41101 - Disclosure - DEFERRED COMPENSATION (Narrative) (Details)link:presentationLinklink:calculationLinklink:definitionLink41301 - Disclosure - STOCK OPTIONS (Narrative) (Details)link:presentationLinklink:calculationLinklink:definitionLink41401 - Disclosure - STOCK REPURCHASE PROGRAM (Narrative) (Details)link:presentationLinklink:calculationLinklink:definitionLink41501 - Disclosure - LEASES (Narrative) (Details)link:presentationLinklink:calculationLinklink:definitionLink41701 - Disclosure - EMPLOYEE BENEFIT PLANS (Narrative) (Details)link:presentationLinklink:calculationLinklink:definitionLink41801 - Disclosure - CONCENTRATIONS (Narrative) (Details)link:presentationLinklink:calculationLinklink:definitionLink42001 - Disclosure - LEGAL MATTERS (Narrative) (Details)link:presentationLinklink:calculationLinklink:definitionLink00090 - Document - Document and Entity Informationlink:presentationLinklink:calculationLinklink:definitionLink00105 - Statement - CONSOLIDATED BALANCE SHEETS (Parentheticals)link:presentationLinklink:calculationLinklink:definitionLink10101 - Disclosure - DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIESlink:presentationLinklink:calculationLinklink:definitionLink10201 - Disclosure - RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTSlink:presentationLinklink:calculationLinklink:definitionLink10301 - Disclosure - REVENUE RECOGNITIONlink:presentationLinklink:calculationLinklink:definitionLink10401 - Disclosure - INVESTMENTSlink:presentationLinklink:calculationLinklink:definitionLink10501 - Disclosure - INVENTORIESlink:presentationLinklink:calculationLinklink:definitionLink10601 - Disclosure - TARIFF REFUND MATTERSlink:presentationLinklink:calculationLinklink:definitionLink10701 - Disclosure - EQUIPMENT AND LEASEHOLD IMPROVEMENTSlink:presentationLinklink:calculationLinklink:definitionLink10801 - Disclosure - INCOME TAXESlink:presentationLinklink:calculationLinklink:definitionLink10901 - Disclosure - CREDIT FACILITYlink:presentationLinklink:calculationLinklink:definitionLink11001 - Disclosure - ACCRUED LIABILITIESlink:presentationLinklink:calculationLinklink:definitionLink11101 - Disclosure - DEFERRED COMPENSATIONlink:presentationLinklink:calculationLinklink:definitionLink11201 - Disclosure - LOSS PER COMMON SHARElink:presentationLinklink:calculationLinklink:definitionLink11301 - Disclosure - STOCK OPTIONSlink:presentationLinklink:calculationLinklink:definitionLink11401 - Disclosure - STOCK REPURCHASE PROGRAMlink:presentationLinklink:calculationLinklink:definitionLink11501 - Disclosure - LEASESlink:presentationLinklink:calculationLinklink:definitionLink11601 - Disclosure - RELATED PARTY TRANSACTIONSlink:presentationLinklink:calculationLinklink:definitionLink11701 - Disclosure - EMPLOYEE BENEFIT PLANSlink:presentationLinklink:calculationLinklink:definitionLink11801 - Disclosure - CONCENTRATIONSlink:presentationLinklink:calculationLinklink:definitionLink11901 - Disclosure - SEGMENT INFORMATIONlink:presentationLinklink:calculationLinklink:definitionLink12001 - Disclosure - LEGAL MATTERSlink:presentationLinklink:calculationLinklink:definitionLink20101 - Disclosure - DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policy)link:presentationLinklink:calculationLinklink:definitionLink20201 - Disclosure - RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS (Policy)link:presentationLinklink:calculationLinklink:definitionLink30303 - Disclosure - REVENUE RECOGNITION (Tables)link:presentationLinklink:calculationLinklink:definitionLink30403 - Disclosure - INVESTMENTS (Tables)link:presentationLinklink:calculationLinklink:definitionLink30503 - Disclosure - INVENTORIES (Tables)link:presentationLinklink:calculationLinklink:definitionLink30703 - Disclosure - EQUIPMENT AND LEASEHOLD IMPROVEMENTS (Tables)link:presentationLinklink:calculationLinklink:definitionLink30803 - Disclosure - INCOME TAXES (Tables)link:presentationLinklink:calculationLinklink:definitionLink31003 - Disclosure - ACCRUED LIABILITIES (Tables)link:presentationLinklink:calculationLinklink:definitionLink31203 - Disclosure - LOSS PER COMMON SHARE (Tables)link:presentationLinklink:calculationLinklink:definitionLink31303 - Disclosure - STOCK OPTIONS (Tables)link:presentationLinklink:calculationLinklink:definitionLink31503 - Disclosure - LEASES (Tables)link:presentationLinklink:calculationLinklink:definitionLink31903 - Disclosure - SEGMENT INFORMMATION (Tables)link:presentationLinklink:calculationLinklink:definitionLink40401 - Disclosure - INVESTMENTS (Narrative) (Details)link:presentationLinklink:calculationLinklink:definitionLink40601 - Disclosure - TARIFF REFUND MATTERS (Narrative) (Details)link:presentationLinklink:calculationLinklink:definitionLink40701 - Disclosure - EQUIPMENT AND LEASEHOLD IMPROVEMENTS (Narrative) (Details)link:presentationLinklink:calculationLinklink:definitionLink40803 - Disclosure - INCOME TAXES (Schedule of Unrecognized Tax Benefits) (Details)link:presentationLinklink:calculationLinklink:definitionLink40806 - Disclosure - INCOME TAXES (Schedule of Change in Valuation Allowance) (Details)link:presentationLinklink:calculationLinklink:definitionLink41303 - Disclosure - STOCK OPTIONS (Stock Option Activity) (Details)link:presentationLinklink:calculationLinklink:definitionLink41304 - Disclosure - STOCK OPTIONS (Intrinsic Value) (Details)link:presentationLinklink:calculationLinklink:definitionLink41305 - Disclosure - STOCK OPTIONS (Nonvested Option Activity) (Details)link:presentationLinklink:calculationLinklink:definitionLink41502 - Disclosure - LEASES (Lease Expense) (Details)link:presentationLinklink:calculationLinklink:definitionLink41504 - Disclosure - LEASES (Additional Information of Finance Lease) (Details)link:presentationLinklink:calculationLinklink:definitionLink41901 - Disclosure - SEGMENT INFORMATION (Narrative) (Details)link:presentationLinklink:calculationLinklink:definitionLink