Note 7 - Intangible Assets - Amortization Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Amortization expense	$ 346	$ 21	$ 165
Cost of Goods Sold [Member]
Amortization expense	21	21	165
Research and Development Expense [Member]
Amortization expense	161	0	0
Selling, General and Administrative Expenses [Member]
Amortization expense	$ 164	$ 0	$ 0