Note 2 - Summary of Significant Accounting Policies - Concentrations (Details) - customer	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenue Benchmark
Concentrations
Number of Major Customers		2		2
Customer Concentration Risk | Revenue Benchmark
Concentrations
Number of Major Customers	4		3
Customer Concentration Risk | Revenue Benchmark | Customer A
Concentrations
Concentration Risk, Percentage	26.00%		25.00%
Customer Concentration Risk | Revenue Benchmark | Customer B
Concentrations
Concentration Risk, Percentage	14.00%		19.00%
Customer Concentration Risk | Revenue Benchmark | Customer C
Concentrations
Concentration Risk, Percentage	13.00%		10.00%
Customer Concentration Risk | Revenue Benchmark | Customer D
Concentrations
Concentration Risk, Percentage	12.00%
Customer Concentration Risk | Revenue Benchmark | Total Customer Base
Concentrations
Concentration Risk, Percentage	65.00%	46.00%	53.00%
Customer Concentration Risk | Accounts Receivable.
Concentrations
Number of Major Customers	4		3
Customer Concentration Risk | Accounts Receivable. | Total Customer Base
Concentrations
Concentration Risk, Percentage	62.00%		56.00%	52.00%