Note 15 - Selected Quarterly Financial Data (Unaudited) - Schedule of Quarterly Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 51,146	$ 39,459	$ 36,374	$ 41,936	$ 45,612	$ 61,380	$ 65,761	$ 57,460	$ 168,915	$ 230,213	$ 227,574
Gross profit	2,400	3,770	6,240	11,002	12,350	16,397	22,542	16,454
Operating income	(8,354)	(7,582)	(4,299)	1,142	1,941	6,452	12,889	8,250	(19,093)	29,532	24,096
Net income	$ (4,746)	$ (4,776)	$ 2,652	$ 1,963	$ 1,888	$ 5,550	$ 10,613	$ 6,883	$ (4,907)	$ 24,934	$ 25,074
Basic (in dollars per share)	$ (0.11)	$ (0.11)	$ 0.06	$ 0.05	$ 0.05	$ 0.14	$ 0.26	$ 0.17	$ (0.12)	$ 0.61	$ 0.63
Diluted (in dollars per share)	$ (0.11)	$ (0.11)	$ 0.06	$ 0.05	$ 0.05	$ 0.14	$ 0.26	$ 0.17	$ (0.12)	$ 0.61	$ 0.62