Note 3 - Revenue Recognition 1 (Details Textual) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Contract with Customer, Liability, Revenue Recognized	$ 0.2	$ 0.2	$ 0.5	$ 0.7
Accounts Receivable, Allowance for Credit Loss	$ 1.6		$ 1.6		$ 1.6
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Number of Major Customers			4		1
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer One [Member]
Concentration Risk, Percentage			18.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer Two [Member]
Concentration Risk, Percentage			16.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer Three [Member]
Concentration Risk, Percentage			15.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer Four [Member]
Concentration Risk, Percentage			14.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]
Concentration Risk, Percentage					69.00%