Note 13 - Income Taxes - Components of Net Deferred Tax Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net operating loss carry forwards	$ 253,544	$ 258,390	$ 261,472
Business credit carryforwards	59,726	59,514	55,574
Compensation	37,876	40,647	58,112
Sec 174 R&D expenses	10,371
Accrued legal verdict	3,878	14,144	11,880
Carryforward of disallowed interest	4,761	4,537	3,093
Accrued expenses	50	104	561
Lease liabilities	4,035	4,839	5,657
Other	3,560	1,306	804
Subtotal	377,801	383,481	397,153
Lease right-of-use assets	(2,870)	(3,470)	(4,099)
Inventory	242	406	(21)
Other deferred tax liabilities	(211)	(318)	(464)
Subtotal	(2,839)	(3,382)	(4,584)
Total deferred tax assets	374,962	380,099	392,569
Valuation allowance	(374,962)	(380,099)	(392,569)
Net deferred tax assets	$ 0	$ 0	$ 0