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Note 15 - Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Accrued expenses $ 756 $ 857
Warrants and stock options 2,309 3,226
Intangibles 429 612
Inventories 220 169
Other assets 625 983
Net operating loss 6,374 4,333
Less valuation allowance (6,633) (4,559)
Total deferred tax assets 4,080 5,621
Deferred tax liabilities:    
Depreciation (9,528) (10,860)
Goodwill (1,518) (1,764)
Total deferred tax liabilities (11,046) (12,624)
Net deferred tax liability $ (6,966) $ (7,003)