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CONSOLIDATED BALANCE SHEETS (USD $)
Dec. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 24,459,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 36,382,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable-net of allowance for sales returns and doubtful accounts of $354,000 and $564,000 1,650,000us-gaap_AccountsReceivableNetCurrent 942,000us-gaap_AccountsReceivableNetCurrent
Inventory 15,735,000us-gaap_InventoryNet 17,537,000us-gaap_InventoryNet
Investment securities 28,185,000us-gaap_ShortTermInvestments 31,420,000us-gaap_ShortTermInvestments
Income taxes, prepaid 5,099,000us-gaap_PrepaidTaxes 0us-gaap_PrepaidTaxes
Prepaid expenses and other current assets 2,875,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent 2,526,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Deferred tax assets 3,727,000us-gaap_DeferredTaxAssetsNetCurrent 1,957,000us-gaap_DeferredTaxAssetsNetCurrent
Current assets of discontinued operations 184,000us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent 1,190,000us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
Total current assets 81,914,000us-gaap_AssetsCurrent 91,954,000us-gaap_AssetsCurrent
Property, plant and equipment - net 33,477,000us-gaap_PropertyPlantAndEquipmentNet 34,476,000us-gaap_PropertyPlantAndEquipmentNet
Other assets 497,000us-gaap_OtherAssetsNoncurrent 231,000us-gaap_OtherAssetsNoncurrent
Long-term assets of discontinued operations 22,000us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent 5,989,000us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent
TOTAL ASSETS 115,910,000us-gaap_Assets 132,650,000us-gaap_Assets
Current liabilities:    
Accounts payable and accrued expenses 21,854,000us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent 22,230,000us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
Income taxes payable 0us-gaap_TaxesPayableCurrent 99,000us-gaap_TaxesPayableCurrent
Current maturities of capital leases 232,000us-gaap_CapitalLeaseObligationsCurrent 222,000us-gaap_CapitalLeaseObligationsCurrent
Current liabilities of discontinued operations 4,858,000us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent 4,550,000us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent
Total current liabilities 26,944,000us-gaap_LiabilitiesCurrent 27,101,000us-gaap_LiabilitiesCurrent
Other liabilities:    
Capital leases, net of current portion 242,000us-gaap_CapitalLeaseObligationsNoncurrent 474,000us-gaap_CapitalLeaseObligationsNoncurrent
Deferred tax liabilities 5,492,000us-gaap_DeferredTaxLiabilitiesNoncurrent 6,659,000us-gaap_DeferredTaxLiabilitiesNoncurrent
Long-term liabilities of discontinued operations 2,756,000us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent 0us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent
Total liabilities 35,434,000us-gaap_Liabilities 34,234,000us-gaap_Liabilities
Stockholders' Equity:    
Preferred stock, $.001 par value (1,500,000 authorized, no shares issued and outstanding) 0us-gaap_PreferredStockValue 0us-gaap_PreferredStockValue
Common stock; par value $.001 per share; 20,000,000 shares authorized; 12,365,690 and 13,143,309 issued 12,075,764 and 13,115,642 issued and outstanding 12,000us-gaap_CommonStockValue 13,000us-gaap_CommonStockValue
Additional paid-in capital 1,132,000us-gaap_AdditionalPaidInCapitalCommonStock 0us-gaap_AdditionalPaidInCapitalCommonStock
Accumulated other comprehensive income 435,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 703,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Retained earnings 78,897,000us-gaap_RetainedEarningsAccumulatedDeficit 97,700,000us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' equity 80,476,000us-gaap_StockholdersEquity 98,416,000us-gaap_StockholdersEquity
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY $ 115,910,000us-gaap_LiabilitiesAndStockholdersEquity $ 132,650,000us-gaap_LiabilitiesAndStockholdersEquity