Note 14 - Selected Quarterly Financial Data (Unaudited) - Schedule of Quarterly Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 45,612	$ 61,380	$ 65,761	$ 57,460	$ 44,187	$ 62,166	$ 65,278	$ 55,943	$ 230,213	$ 227,574	$ 61,036
Gross profit	12,350	16,397	22,542	16,454	9,229	12,760	17,418	11,612
Operating income (loss)	1,941	6,452	12,889	8,250	2,025	5,804	10,647	5,620	29,532	24,096	(15,893)
Net income	$ 1,888	$ 5,550	$ 10,613	$ 6,883	$ 3,394	$ 6,211	$ 10,203	$ 5,266	$ 24,934	$ 25,074	$ (15,417)
Basic (in dollars per share)	$ 0.05	$ 0.14	$ 0.26	$ 0.17	$ 0.08	$ 0.15	$ 0.25	$ 0.13	$ 0.61	$ 0.63	$ (0.41)
Diluted (in dollars per share)	$ 0.05	$ 0.14	$ 0.26	$ 0.17	$ 0.08	$ 0.15	$ 0.25	$ 0.13	$ 0.61	$ 0.62	$ (0.41)