Note 2 - Summary of Significant Accounting Policies - Credit Concentration (Details) - Customer Concentration Risk [Member]	6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Customer A [Member] | Revenue from Contract with Customer Benchmark [Member]
Credit concentration	35.00%	10.00%
Customer A [Member] | Accounts Receivable [Member]
Credit concentration	11.00%		10.00%
Customer B [Member] | Revenue from Contract with Customer Benchmark [Member]
Credit concentration	17.00%	10.00%
Customer B [Member] | Accounts Receivable [Member]
Credit concentration	31.00%		10.00%
Customer C [Member] | Revenue from Contract with Customer Benchmark [Member]
Credit concentration	10.00%	10.00%
Customer G [Member] | Accounts Receivable [Member]
Credit concentration	15.00%		10.00%
Customer D [Member] | Revenue from Contract with Customer Benchmark [Member]
Credit concentration	10.00%	22.00%
Customer H [Member] | Accounts Receivable [Member]
Credit concentration	10.00%		32.00%
Customer E [Member] | Revenue from Contract with Customer Benchmark [Member]
Credit concentration	10.00%	19.00%
Customer I [Member] | Accounts Receivable [Member]
Credit concentration	10.00%		12.00%
Customer F [Member] | Revenue from Contract with Customer Benchmark [Member]
Credit concentration	10.00%	11.00%