Note 4 - Accounts Receivable and Revenues - Revenues and Accounts Receivable from Significant Customers (Details) - Customer Concentration Risk [Member]	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Revenue Benchmark [Member] | Customer A [Member]
Concentration risk, percentage	26.00%	20.00%
Revenue Benchmark [Member] | Customer B [Member]
Concentration risk, percentage	13.00%	13.00%
Revenue Benchmark [Member] | Customer C [Member]
Concentration risk, percentage	10.00%	11.00%
Accounts Receivable [Member] | Customer A [Member]
Concentration risk, percentage	32.00%	12.00%
Accounts Receivable [Member] | Customer B [Member]
Concentration risk, percentage	11.00%	19.00%
Accounts Receivable [Member] | Customer C [Member]
Concentration risk, percentage	10.00%	9.00%