Note 2 - New Accounting Pronouncements - Changes in the Allowance for Expected Credit Losses (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)
Beginning balance of the allowance for expected credit losses	$ 0
Ending balance of the allowance for expected credit losses	779
Accounting Standards Update 2016-13 [Member]
Beginning balance of the allowance for expected credit losses	755
Current period provision for expected credit losses	24
Ending balance of the allowance for expected credit losses	$ 779