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Note 8 - Deferred Income Tax Assets and Liabilities (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Deferred income tax assets:    
Allowance for doubtful accounts $ 150
Capitalized inventory costs $ 260,385 306,592
Warrants and stock-based compensation 44,151 44,151
Accrued expenses, reserves, and other 66,444 64,747
Total deferred income tax assets 370,980 415,640
Deferred income tax liabilities:    
Property and equipment depreciation 1,529,397 1,299,826
Goodwill and other intangible assets amortization 217,268 202,328
Total deferred income tax liabilities 1,746,665 1,502,154
Net deferred tax asset (liability) $ (1,375,685) $ (1,086,514)