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Condensed Consolidated Balance Sheets (Current Period Unaudited) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Current assets:    
Cash $ 6,564,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 6,859,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable, net 3,352,000us-gaap_AccountsReceivableNetCurrent 2,019,000us-gaap_AccountsReceivableNetCurrent
Inventory 2,560,000us-gaap_InventoryNet 4,079,000us-gaap_InventoryNet
Prepaid expenses & other assets 280,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent 432,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 12,756,000us-gaap_AssetsCurrent 13,389,000us-gaap_AssetsCurrent
Property, plant & equipment, net 60,000us-gaap_PropertyPlantAndEquipmentNet 69,000us-gaap_PropertyPlantAndEquipmentNet
Other assets:    
Other long term receivable 78,000us-gaap_OtherAssets 96,000us-gaap_OtherAssets
Total other assets 78,000us-gaap_OtherAssetsNoncurrent 96,000us-gaap_OtherAssetsNoncurrent
Total assets 12,894,000us-gaap_Assets 13,554,000us-gaap_Assets
Current liabilities:    
Accounts payable 903,000us-gaap_AccountsPayableCurrent 783,000us-gaap_AccountsPayableCurrent
Accrued expenses 814,000us-gaap_AccruedLiabilitiesCurrent 1,687,000us-gaap_AccruedLiabilitiesCurrent
Total current liabilities 1,717,000us-gaap_LiabilitiesCurrent 2,470,000us-gaap_LiabilitiesCurrent
Note payable 0us-gaap_LongTermNotesPayable 0us-gaap_LongTermNotesPayable
Total liabilities 1,717,000us-gaap_Liabilities 2,470,000us-gaap_Liabilities
Shareholders' Equity:    
Common stock: authorized 25,000,000 shares $1.00 par value; shares issued and outstanding: 11,680,395 shares as of March 31, 2015 11,771,286 shares as of March 31, 2014 11,680,395 shares as of December 31, 2014 11,680,000us-gaap_CommonStockValue 11,680,000us-gaap_CommonStockValue
Additional paid-in capital 5,118,000us-gaap_AdditionalPaidInCapital 5,118,000us-gaap_AdditionalPaidInCapital
Accumulated deficit (5,501,000)us-gaap_RetainedEarningsAccumulatedDeficit (5,580,000)us-gaap_RetainedEarningsAccumulatedDeficit
Unearned compensation (120,000)us-gaap_DeferredCompensationEquity (134,000)us-gaap_DeferredCompensationEquity
Total shareholders' equity 11,177,000us-gaap_StockholdersEquity 11,084,000us-gaap_StockholdersEquity
Total liabilities & shareholders' equity $ 12,894,000us-gaap_LiabilitiesAndStockholdersEquity $ 13,554,000us-gaap_LiabilitiesAndStockholdersEquity