Note 1 - Nature of Business and Summary of Significant Accounting Policies - Major Customers (Details) - Customer Concentration Risk [Member]	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Revenue Benchmark [Member]
Percent of revenue	100.00%	100.00%
Revenue Benchmark [Member] | Major Customers [Member]
Percent of revenue	19.20%	31.70%
Revenue Benchmark [Member] | Other Customer [Member]
Percent of revenue	80.80%	68.30%
Accounts Receivable [Member]
Percent of revenue	100.00%	100.00%
Accounts Receivable [Member] | Major Customers [Member]
Percent of revenue	0.00%	33.70%
Accounts Receivable [Member] | Other Customer [Member]
Percent of revenue	100.00%	66.30%