Note 2 - Summary of Significant Accounting Policies - Concentration of Credit Risk (Details) - Customer Concentration Risk [Member] - Revenue Benchmark [Member]	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Customer A [Member]
Customer	28.00%	20.00%	18.00%
Customer B [Member]
Customer	15.00%	16.00%	13.00%	15.00%
Customer C [Member]
Customer	13.00%	19.00%	16.00%	21.00%
Customer D [Member]
Customer	11.00%	13.00%	10.00%	11.00%
Customer E [Member]
Customer	10.00%	13.00%	13.00%	22.00%
Customer F [Member]
Customer		10.00%		13.00%