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Income Taxes (Details 2) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Deferred Tax Assets:    
Accrued expenses $ 183,000 $ 171,000
Inventory reserve 42,000 65,000
Stock-based awards 52,000 53,000
Reserve for bad debts 50,000 51,000
Net operating loss carryforwards 61,000 26,000
Other 25,000 38,000
Valuation allowance (108,000) (31,000)
Total deferred tax assets 305,000 373,000
Deferred Tax Liabilities:    
Depreciation (465,000) (400,000)
Prepaid expenses (85,000) (175,000)
Prepaid compensation 0 (3,000)
Total deferred tax liabilities (550,000) (578,000)
Net deferred income tax liabilities $ (245,000) $ (205,000)