Note 9 - Employee Benefit Plans - Stock Options Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Outstanding (in shares)	1,027	1,045
Outstanding, weighted average exercise price (in dollars per share)	$ 9.75	$ 9.65
Granted (in shares)	102	116
Granted, weighted average exercise price (in dollars per share)	$ 13.79	$ 10.35
Exercised (in shares)	(238)	(81)
Exercised, weighted average exercise price (in dollars per share)	$ 5.41	$ 6.93
Canceled (in shares)	(87)	(30)
Canceled, weighted average exercise price (in dollars per share)	$ 14.57	$ 13.41
Expired (in shares)	(59)	(23)
Expired, weighted average exercise price (in dollars per share)	$ 15.83	$ 13.16
Outstanding (in shares)	745	1,027
Outstanding, weighted average exercise price (in dollars per share)	$ 10.64	$ 9.75
Outstanding, weighted average remaining contractual term (Year)	4 years 178 days
Outstanding, aggregate intrinsic value	$ 4,777
Vested and expected to vest (in shares)	731
Vested and expected to vest, weighted average exercise price (in dollars per share)	$ 10.59
Vested and expected to vest, weighted average remaining contractual term (Year)	4 years 146 days
Vested and expected to vest, aggregate intrinsic value	$ 4,722
Exercisable (in shares)	571
Exercisable, weighted average exercise price (in dollars per share)	$ 9.92
Exercisable, weighted average remaining contractual term (Year)	3 years 76 days
Exercisable, aggregate intrinsic value	$ 4,090