Note 13 - Major Customers and Related Information (Details Textual) - Customer Concentration Risk [Member]	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Revenue Benchmark [Member]
Number of Major Customers	2	3
Revenue Benchmark [Member] | Distributor One [Member]
Concentration Risk, Percentage	25.00%	28.00%
Revenue Benchmark [Member] | Distributor Two [Member]
Concentration Risk, Percentage	14.00%	22.00%
Revenue Benchmark [Member] | Distributor Three [Member]
Concentration Risk, Percentage		10.00%
Accounts Receivable [Member]
Number of Major Customers	2		3
Accounts Receivable [Member] | Distributor One [Member]
Concentration Risk, Percentage	50.00%		48.00%
Accounts Receivable [Member] | Distributor Two [Member]
Concentration Risk, Percentage	13.00%		16.00%
Accounts Receivable [Member] | Distributor Three [Member]
Concentration Risk, Percentage			15.00%