Note 2 - New Accounting Pronouncements - Changes in the Allowance for Expected Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020
Beginning balance of the allowance for expected credit losses		$ 0
Ending balance of the allowance for expected credit losses	$ 779	779
Accounting Standards Update 2016-13 [Member]
Beginning balance of the allowance for expected credit losses	779	755
Current period provision for expected credit losses	0	24
Ending balance of the allowance for expected credit losses	$ 779	$ 779