Note 17 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Deferred Tax Assets, Valuation Allowance	$ 64,341	$ 51,437
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	12,904	31,150
Deferred Tax Assets, Net of Valuation Allowance, Total	947	284
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	0	0
Research Tax Credit Carryforward [Member]
Tax Credit Carryforward, Amount	276		$ 0
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards	$ 191,313	$ 163,395