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Consolidated Balance Sheets (USD $)
Dec. 31, 2014
Dec. 31, 2013
Current assets:    
Cash $ 5,495,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 8,215,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Investments 2,840,000us-gaap_AvailableForSaleSecuritiesCurrent 1,606,000us-gaap_AvailableForSaleSecuritiesCurrent
Accounts receivable, net of allowance for doubtful accounts of $60,000 and $85,000 as of December 31, 2014 and 2013, respectively 5,333,000us-gaap_AccountsReceivableNetCurrent 4,815,000us-gaap_AccountsReceivableNetCurrent
Accounts receivable, related party 333,000us-gaap_AccountsReceivableRelatedPartiesCurrent 256,000us-gaap_AccountsReceivableRelatedPartiesCurrent
Inventories 16,544,000us-gaap_InventoryNet 14,140,000us-gaap_InventoryNet
Prepaid expenses 4,472,000us-gaap_PrepaidExpenseCurrent 2,968,000us-gaap_PrepaidExpenseCurrent
Deferred income tax assets 486,000us-gaap_DeferredTaxAssetsNetCurrent 640,000us-gaap_DeferredTaxAssetsNetCurrent
Total current assets 35,503,000us-gaap_AssetsCurrent 32,640,000us-gaap_AssetsCurrent
Property and equipment, net 3,315,000us-gaap_PropertyPlantAndEquipmentNet 3,068,000us-gaap_PropertyPlantAndEquipmentNet
Goodwill 55,000us-gaap_Goodwill 55,000us-gaap_Goodwill
Definite-lived intangible assets, net 71,000us-gaap_FiniteLivedIntangibleAssetsNet 92,000us-gaap_FiniteLivedIntangibleAssetsNet
Equity investments in and advances to unconsolidated affiliate 3,008,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures 2,708,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
Total assets 41,952,000us-gaap_Assets 38,563,000us-gaap_Assets
Current liabilities:    
Accounts payable 1,099,000us-gaap_AccountsPayableCurrent 689,000us-gaap_AccountsPayableCurrent
Accrued liabilities 1,195,000us-gaap_AccruedLiabilitiesCurrent 1,036,000us-gaap_AccruedLiabilitiesCurrent
Total current liabilities 2,294,000us-gaap_LiabilitiesCurrent 1,725,000us-gaap_LiabilitiesCurrent
Deferred income tax liabilities 1,752,000us-gaap_DeferredTaxLiabilitiesNoncurrent 1,257,000us-gaap_DeferredTaxLiabilitiesNoncurrent
Total liabilities 4,046,000us-gaap_Liabilities 2,982,000us-gaap_Liabilities
Shareholders' equity:    
Common stock, $.01 par value: 50,000,000 shares authorized; 18,348,556 and 18,878,109 shares outstanding as of December 31, 2014 and 2013, respectively 183,000us-gaap_CommonStockValue 189,000us-gaap_CommonStockValue
Additional paid-in capital 17,833,000us-gaap_AdditionalPaidInCapitalCommonStock 18,994,000us-gaap_AdditionalPaidInCapitalCommonStock
Accumulated other comprehensive income 1,375,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 625,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Retained earnings 18,515,000us-gaap_RetainedEarningsAccumulatedDeficit 15,773,000us-gaap_RetainedEarningsAccumulatedDeficit
Total shareholders' equity 37,906,000us-gaap_StockholdersEquity 35,581,000us-gaap_StockholdersEquity
Total liabilities and shareholders' equity $ 41,952,000us-gaap_LiabilitiesAndStockholdersEquity $ 38,563,000us-gaap_LiabilitiesAndStockholdersEquity