Note 6 - Credit Losses - Allowance for Credit Losses by Portfolio (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2022 USD ($)
Trade Accounts Receivable [Member]
Beginning Balance	$ 4,597
Provision for expected credit losses	512
Beginning Balance	5,109
Other Non-trade Contractual Arrangements [Member]
Beginning Balance	6,948
Provision for expected credit losses	548
Beginning Balance	$ 7,496