Note 9 - Segment Information (Details Textual) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)
Number of Reportable Segments			2
Revenue from Contract with Customer, Including Assessed Tax	$ 58,865	$ 66,440	$ 171,157	$ 191,823
Intersegment Eliminations [Member]
Revenue from Contract with Customer, Including Assessed Tax			$ 0	$ 0