Note 1 - Nature of Business and Summary of Significant Accounting Policies - Major Customers (Details) - Customer Concentration Risk [Member]	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Revenue Benchmark [Member]
Percent of revenue	100.00%	100.00%	100.00%	100.00%
Revenue Benchmark [Member] | Major Customers [Member]
Percent of revenue	26.90%	36.50%	19.90%	38.60%
Revenue Benchmark [Member] | Other Customer [Member]
Percent of revenue	73.10%	63.50%	80.10%	61.40%
Accounts Receivable [Member]
Percent of revenue	100.00%	100.00%	100.00%	100.00%
Accounts Receivable [Member] | Major Customers [Member]
Percent of revenue	38.50%	37.20%	38.50%	37.20%
Accounts Receivable [Member] | Other Customer [Member]
Percent of revenue	61.50%	62.80%	61.50%	62.80%