Note 15 - Share-based Compensation - Restricted Stock Unit/Awards Activity (Details) - Restricted Stock Units (RSUs) [Member] $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2021 USD ($) $ / shares shares
Outstanding, number of shares (in shares) | shares	1,325
Outstanding, weighted average fair value (in dollars per share)	$ 14.97
Outstanding, aggregate intrinsic value | $	$ 11,279
Granted, number of shares (in shares) | shares	1,732
Granted, weighted average fair value (in dollars per share)	$ 10.12
Granted, aggregate intrinsic value | $	$ 16,007
Released, number of shares (in shares) | shares	(590)
Released, weighted average share price on date of release (in dollars per share)	$ 8.59
Released, weighted average fair value (in dollars per share)	$ 15.87
Released, aggregate intrinsic value | $	$ 5,069
Cancelled/Forfeited, number of shares (in shares) | shares	(73)
Cancelled/Forfeited, weighted average fair value (in dollars per share)	$ 13.05
Cancelled/Forfeited, aggregate intrinsic value | $	$ 527
Outstanding, number of shares (in shares) | shares	2,394
Outstanding, weighted average fair value (in dollars per share)	$ 11.30
Outstanding, aggregate intrinsic value | $	$ 17,189
Vested and expected to vest, number of shares (in shares) | shares	2,394
Vested and expected to vest, weighted average fair value (in dollars per share)	$ 11.30
Vested and expected to vest, aggregate intrinsic value | $	$ 17,189