Note 13 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Net operating loss carryforwards	$ 71,967	$ 67,673
Intangible assets	453	1,968
Accrual and reserves	2,946	3,621
Leases	4,428	4,659
Other	8	6
Total noncurrent deferred tax assets	79,802	77,927
Valuation allowance	(72,010)	(70,066)
Noncurrent deferred tax assets, net of valuation allowance	7,792	7,861
Fixed assets	2,834	2,700
Leases	4,956	5,161
Total noncurrent deferred tax liabilities	7,790	7,861
Net deferred income tax liability	$ 2	$ 0