Note 5 - Receivables and Allowance for Credit Losses - Summary of Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Allowance - beginning of period	$ 733	$ 519
Provision for expected credit losses	15	293
Amounts written off against the allowance, net of recoveries	(31)	(55)
Recoveries	10	15
Decrease due to sale of Molded Fiber business	0	(39)
Allowance - end of period	$ 727	$ 733