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CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)
Mar. 31, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 33,423,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 24,459,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable-net of allowance for sales returns and doubtful accounts of $397,000 and $354,000 2,306,000us-gaap_AccountsReceivableNetCurrent 1,650,000us-gaap_AccountsReceivableNetCurrent
Inventory 14,186,000us-gaap_InventoryNet 15,735,000us-gaap_InventoryNet
Investment securities 27,955,000us-gaap_ShortTermInvestments 28,185,000us-gaap_ShortTermInvestments
Income taxes, prepaid 3,897,000us-gaap_PrepaidTaxes 5,099,000us-gaap_PrepaidTaxes
Prepaid expenses and other current assets 2,814,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent 2,875,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Deferred tax assets 2,978,000us-gaap_DeferredTaxAssetsNetCurrent 3,727,000us-gaap_DeferredTaxAssetsNetCurrent
Current assets of discontinued operations 18,000us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent 184,000us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
Total current assets 87,577,000us-gaap_AssetsCurrent 81,914,000us-gaap_AssetsCurrent
Property, plant and equipment - net 32,507,000us-gaap_PropertyPlantAndEquipmentNet 33,477,000us-gaap_PropertyPlantAndEquipmentNet
Other assets 162,000us-gaap_OtherAssetsNoncurrent 497,000us-gaap_OtherAssetsNoncurrent
Long-term assets of discontinued operations 19,000us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent 22,000us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent
TOTAL ASSETS 120,265,000us-gaap_Assets 115,910,000us-gaap_Assets
Current liabilities:    
Accounts payable and accrued expenses 25,468,000us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent 21,854,000us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
Current maturities of capital leases 234,000us-gaap_CapitalLeaseObligationsCurrent 232,000us-gaap_CapitalLeaseObligationsCurrent
Current liabilities of discontinued operations 2,348,000us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent 4,858,000us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent
Total current liabilities 28,050,000us-gaap_LiabilitiesCurrent 26,944,000us-gaap_LiabilitiesCurrent
Other liabilities:    
Capital leases, net of current portion 183,000us-gaap_CapitalLeaseObligationsNoncurrent 242,000us-gaap_CapitalLeaseObligationsNoncurrent
Deferred tax liabilities 5,493,000us-gaap_DeferredTaxLiabilitiesNoncurrent 5,492,000us-gaap_DeferredTaxLiabilitiesNoncurrent
Long-term liabilities of discontinued operations 1,712,000us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent 2,756,000us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent
Total liabilities 35,438,000us-gaap_Liabilities 35,434,000us-gaap_Liabilities
Stockholders' Equity:    
Common stock; par value $.001 per share; 20,000,000 shares authorized; 12,391,652 and 12,365,690 issued 12,124,699 and 12,075,764 issued and outstanding 12,000us-gaap_CommonStockValue 12,000us-gaap_CommonStockValue
Additional paid-in capital 951,000us-gaap_AdditionalPaidInCapital 1,132,000us-gaap_AdditionalPaidInCapital
Accumulated other comprehensive income 523,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 435,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Retained earnings 83,341,000us-gaap_RetainedEarningsAccumulatedDeficit 78,897,000us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' equity 84,827,000us-gaap_StockholdersEquity 80,476,000us-gaap_StockholdersEquity
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY $ 120,265,000us-gaap_LiabilitiesAndStockholdersEquity $ 115,910,000us-gaap_LiabilitiesAndStockholdersEquity