Note 6 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Tax Expense (Benefit), Total	$ (3,522)	$ 5,185
Effective Income Tax Rate Reconciliation, Percent, Total	44.20%	16.40%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-Based Payment Arrangement, Amount	$ (2,295)	$ 339
Open Tax Year	2018 2019 2020 2021
State and Local Jurisdiction [Member] | Release of Valuation Allowance for Net Operating Losses [Member]
Income Tax Expense (Benefit), Total	$ (937)