Note 16 - Stock-based Compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Stock-based compensation	$ 9,874	$ 2,125	$ 1,349
Equity Classified Awards [Member]
Stock-based compensation	7,700	2,101	1,221
Liability Classified Awards [Member]
Stock-based compensation	2,174	24	128
Cost of Goods Sold [Member]
Stock-based compensation	40	0	0
Cost of Goods Sold [Member] | Share-based Payment Arrangement, Option [Member]
Stock-based compensation	16	0	0
Cost of Goods Sold [Member] | Restricted Stock [Member]
Stock-based compensation	27	0	0
Research and Development Expense [Member]
Stock-based compensation	2,000	600	300
Research and Development Expense [Member] | Share-based Payment Arrangement, Option [Member]
Stock-based compensation	681	0	0
Research and Development Expense [Member] | Restricted Stock [Member]
Stock-based compensation	1,345	481	228
Research and Development Expense [Member] | Stock Appreciation Rights (SARs) [Member]
Stock-based compensation	9	137	66
Selling, General and Administrative Expenses [Member]
Stock-based compensation	7,800	1,500	1,100
Selling, General and Administrative Expenses [Member] | Share-based Payment Arrangement, Option [Member]
Stock-based compensation	1,990	0	0
Selling, General and Administrative Expenses [Member] | Restricted Stock [Member]
Stock-based compensation	3,641	1,620	993
Selling, General and Administrative Expenses [Member] | Restricted Stock, Liability Classified Awards [Member]
Stock-based compensation	2,165	0	0
Selling, General and Administrative Expenses [Member] | Stock Appreciation Rights (SARs) [Member]
Stock-based compensation	$ 0	$ (113)	$ 62