Note 8 - Income Taxes - Schedule of Summary of Operating Loss Carryforwards (Details) $ in Thousands	Dec. 31, 2021 USD ($)
2022	$ 47,137
2023	47,150
2024	50,140
2025	17,266
2026 and thereafter	152,923
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	$ 314,616