Note 2 - Summary of Significant Accounting Policies - Credit Concentration (Details) - Customer Concentration Risk [Member]	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Customer A [Member] | Revenue from Contract with Customer Benchmark [Member]
Credit concentration	74.00%	4.00%	76.00%	44.00%
Customer A [Member] | Accounts Receivable [Member]
Credit concentration			67.00%	11.00%
Customer B [Member] | Revenue from Contract with Customer Benchmark [Member]
Credit concentration	10.00%	10.00%	10.00%	14.00%
Customer B [Member] | Accounts Receivable [Member]
Credit concentration			10.00%	31.00%
Customer C [Member] | Revenue from Contract with Customer Benchmark [Member]
Credit concentration	10.00%	10.00%	10.00%	10.00%
Customer D [Member] | Accounts Receivable [Member]
Credit concentration			10.00%	15.00%