Note 14 - Income Taxes - Significant Portions of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Net operating loss carryforwards	$ 12,130	$ 12,317
Inventory and accounts receivable reserves	306	234
Other	1,956	569
Valuation allowance	(12,447)	(12,333)
Deferred tax assets after valuation allowance	1,945	787
Deferred tax liabilities
Intangible assets	(476)	(848)
Property, plant and equipment, liability	(1,469)
Property, plant and equipment, asset		61
Total deferred tax liabilities	(1,945)	(787)
Net deferred tax asset	$ 0	0
Net deferred tax (liability)