Note 5 - Accounts Receivable - Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Balance at January 1, 2021	$ 11,997	$ 18,490	$ 18,490
Write-offs	(259)		(6,230)
(Recovery) Provision	1,004	$ 1,106	(263)
Balance at December 31, 2021	$ 12,742		$ 11,997