Note 2 - Allowance for Doubtful Accounts Receivable - Allowance for Doubtful Accounts Receivable (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Balance at the beginning of year	$ 7,622	$ 6,393
Provision for bad debts - accounts receivable	539	2,891
Charge-offs	(3,924)	(1,686)
Recoveries	0	24
Balance at the end of year	$ 4,237	$ 7,622