Note 11 - Concentrations (Details Textual)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Distributor One [Member]
Concentration Risk, Percentage	49.00%	38.00%	11.00%	33.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Distributor Two [Member]
Concentration Risk, Percentage			38.00%
Revenue Benchmark [Member] | Geographic Concentration Risk [Member] | CHINA
Concentration Risk, Percentage		19.00%		21.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Distributor One [Member]
Concentration Risk, Percentage			13.00%		13.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Distributor Two [Member]
Concentration Risk, Percentage			14.00%		28.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Distributor Three [Member]
Concentration Risk, Percentage			25.00%		29.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Distributor Four [Member]
Concentration Risk, Percentage			31.00%