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Income Taxes - Deferred Tax Assets (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Deferred Tax Assets:    
Accrued expenses $ 126,000 $ 68,000
Stock-based awards 83,000 73,000
Reserve for bad debts 29,000 32,000
Inventory reserve 12,000 13,000
Net operating loss carryforwards   32,000
Other 9,000 7,000
Total deferred tax assets 259,000 225,000
Deferred Tax Liabilities:    
Depreciation (322,000) (324,000)
Prepaid expenses (84,000)  
Prepaid compensation (52,000) (71,000)
Total deferred tax liabilities (458,000) (395,000)
Net deferred income tax liabilities $ (199,000) $ (170,000)