Note O - Income Taxes - Net Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
NOL carryforward	$ 21,516	$ 12,049
Inventory reserves	2,385	1,490
AMT credit	172	172
Unrealized gains and losses	96	69
Share-based compensation	528	510
Foreign tax credit	4,599	4,599
Research and development credits	8,264	6,648
Interest	888	208
ASC 842 Assets	1,641	0
Other	520	718
Deferred tax assets	40,609	26,463
Less valuation allowance	(25,736)	0
Deferred tax assets, net	14,873	26,463
Depreciation and amortization	(6,180)	(4,749)
ASC 842 Liabilities	(1,406)	0
Deferred tax liabilities	(7,586)	(4,749)
Deferred tax assets (liabilities), net	$ 7,287	$ 21,714