Note 7 - Credit Losses - Allowance for Credit Losses by Portfolio (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($)
Trade Accounts Receivable [Member]
Beginning Balance	$ 4,597
Provision for expected credit losses	1,348
Beginning Balance	5,945
Other Non-trade Contractual Arrangements [Member]
Beginning Balance	6,948
Provision for expected credit losses	682
Beginning Balance	$ 7,630