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Note 16 - Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:    
Accrued expenses $ 931 $ 756
Stock options, restricted stock and other 2,908 2,309
Intangible assets 748 429
Inventories 154 220
Other assets 666 625
Net operating loss 6,605 6,374
Less valuation allowance (6,900) (6,633)
Total deferred tax assets 5,112 4,080
Deferred tax liabilities:    
Depreciation (21,788) (9,528)
Goodwill (3,486) (1,518)
Total deferred tax liabilities (25,274) (11,046)
Net deferred tax liability $ (20,162) $ (6,966)