Note 14 - Segment Information (Details Textual) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Number of Operating Segments									2
Number of Reportable Segments									2
Revenue from Contract with Customer, Including Assessed Tax	$ 75,796	$ 100,983	$ 76,658	$ 89,654	$ 70,609	$ 87,242	$ 69,473	$ 82,410	$ 343,091	$ 309,734	$ 266,504
Intersegment Eliminations [Member]
Revenue from Contract with Customer, Including Assessed Tax									$ 5,600	$ 3,700	$ 2,000