Note 16 - Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Accrued expenses	$ 1,362	$ 931
Leases	3,337	0
Warrants and stock options	3,325	2,908
Intangible assets	1,171	748
Inventories	169	154
Other assets	1,765	666
Net operating loss	6,513	6,605
Less valuation allowance	(8,248)	(6,900)
Total deferred tax assets	9,394	5,112
Deferred tax liabilities:
Depreciation	(26,750)	(21,788)
Goodwill	(5,590)	(3,486)
Leases	(3,337)	0
Total deferred tax liabilities	(35,677)	(25,274)
Net deferred tax liability	$ (26,283)	$ (20,162)