Note 17 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Unrecognized Tax Benefits, Ending Balance	$ 0	$ 0
Income Tax Expense (Benefit), Total	(1,707)	(4,642)	$ 8,928
Accounting Standards Update 2016-09 [Member]
Income Tax Expense (Benefit), Total	100	$ 200
State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total	2,700
State and Local Jurisdiction [Member] | Research Tax Credit Carryforward [Member]
Tax Credit Carryforward, Amount	500
Internal Revenue Service (IRS) [Member] | Domestic Tax Authority [Member]
Operating Loss Carryforwards, Total	4,600
Internal Revenue Service (IRS) [Member] | Domestic Tax Authority [Member] | Research Tax Credit Carryforward [Member]
Tax Credit Carryforward, Amount	2,500
Ministry of the Economy, Finance and Industry, France [Member] | Foreign Tax Authority [Member]
Operating Loss Carryforwards, Total	$ 7,100