Note 15 - Share-based Compensation - Restricted Stock Unit/Awards Activity (Details) - Restricted Stock Units (RSUs) [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Outstanding, number of shares (in shares)	1,325
Outstanding, weighted average fair value (in dollars per share)	$ 11.51	$ 14.97
Outstanding, aggregate intrinsic value	$ 22,700	$ 11,279
Granted, number of shares (in shares)	1,716
Granted, weighted average fair value (in dollars per share)	$ 10.14
Granted, aggregate intrinsic value	$ 2,897
Released, number of shares (in shares)	(304)
Released, weighted average share price on date of release (in dollars per share)	$ 9.39
Released, weighted average fair value (in dollars per share)	$ 18.46
Released, aggregate intrinsic value	$ 2,856
Cancelled/Forfeited, number of shares (in shares)	(57)
Cancelled/Forfeited, weighted average fair value (in dollars per share)	$ 13.34
Cancelled/Forfeited, aggregate intrinsic value	$ 485
Outstanding, number of shares (in shares)	2,680
Vested and expected to vest, number of shares (in shares)	2,680
Vested and expected to vest, weighted average fair value (in dollars per share)	$ 11.51
Vested and expected to vest, aggregate intrinsic value	$ 22,700