Note 8 - Credit Losses - Impact of ASC 326 - Allowance for Credit Losses by Portfolio (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2021 USD ($)
Beginning Balance	$ 1,661
Provision for expected credit losses	1,029
Beginning Balance	2,690
Trade Accounts Receivable [Member]
Beginning Balance	4,426
Provision for expected credit losses	(66)
Beginning Balance	4,360
Other Receivables [Member]
Beginning Balance	4,710
Provision for expected credit losses	3,972
Beginning Balance	$ 8,682