Note O - Income Taxes - Net Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
NOL carryforward	$ 47,901	$ 44,448
Inventory reserves	2,892	2,872
Unrealized gains and losses	363	69
Share-based compensation	914	645
Foreign tax credit	4,599	4,599
Research and development credits	10,505	9,879
Interest	3,966	2,840
ASC 842 Assets	1,602	1,740
Other	776	728
Deferred tax assets	73,518	67,820
Less valuation allowance	(69,680)	(57,721)	$ (43,462)	$ (25,736)
Deferred tax assets, net	3,838	10,099
Depreciation and amortization	(2,441)	(8,600)
ASC 842 Liabilities	(1,397)	(1,499)
Deferred tax liabilities	(3,838)	(10,099)
Deferred tax assets (liabilities), net	$ 0	$ 0