Note 9 - Segment Information (Details Textual) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)
Number of Reportable Segments			2
Revenue from Contract with Customer, Including Assessed Tax	$ 50,944	$ 68,223	$ 112,292	$ 125,383
Intersegment Eliminations [Member]
Revenue from Contract with Customer, Including Assessed Tax			$ 0	$ 0