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Note 14 - Employee Benefit Plans - Stock Options Outstanding by Range of Exercise Prices (Details)
 12 Months Ended
Dec. 31, 2017
$ / shares
shares
Range of exercise prices, minimum (in dollars per share) $ 8.78
Range of exercise prices, maximum (in dollars per share) $ 24.07
Options outstanding, number of shares (in shares) | shares 812
Options outstanding, weighted average remaining contractual life (Year) 6 years 302 days
Options outstanding, weighted average exercise price (in dollars per share) $ 21.98
Options exercisable, number of shares (in shares) | shares 711
Options exercisable, weighted average exercise price (in dollars per share) $ 21.85
Range01 [Member]  
Range of exercise prices, minimum (in dollars per share) 8.78
Range of exercise prices, maximum (in dollars per share) $ 10.57
Options outstanding, number of shares (in shares) | shares 7
Options outstanding, weighted average remaining contractual life (Year) 2 years 131 days
Options outstanding, weighted average exercise price (in dollars per share) $ 9.64
Options exercisable, number of shares (in shares) | shares 7
Options exercisable, weighted average exercise price (in dollars per share) $ 9.64
Range 02 [Member]  
Range of exercise prices, minimum (in dollars per share) 10.65
Range of exercise prices, maximum (in dollars per share) $ 10.65
Options outstanding, number of shares (in shares) | shares 7
Options outstanding, weighted average remaining contractual life (Year) 5 years 21 days
Options outstanding, weighted average exercise price (in dollars per share) $ 10.65
Options exercisable, number of shares (in shares) | shares 4
Options exercisable, weighted average exercise price (in dollars per share) $ 10.65
Range 03 [Member]  
Range of exercise prices, minimum (in dollars per share) 10.76
Range of exercise prices, maximum (in dollars per share) $ 10.76
Options outstanding, number of shares (in shares) | shares 3
Options outstanding, weighted average remaining contractual life (Year) 2 years 18 days
Options outstanding, weighted average exercise price (in dollars per share) $ 10.76
Options exercisable, number of shares (in shares) | shares 3
Options exercisable, weighted average exercise price (in dollars per share) $ 10.76
Range 04 [Member]  
Range of exercise prices, minimum (in dollars per share) 15.16
Range of exercise prices, maximum (in dollars per share) $ 15.16
Options outstanding, number of shares (in shares) | shares 36
Options outstanding, weighted average remaining contractual life (Year) 149 days
Options outstanding, weighted average exercise price (in dollars per share) $ 15.16
Options exercisable, number of shares (in shares) | shares 36
Options exercisable, weighted average exercise price (in dollars per share) $ 15.16
Range 05 [Member]  
Range of exercise prices, minimum (in dollars per share) 20.29
Range of exercise prices, maximum (in dollars per share) $ 20.29
Options outstanding, number of shares (in shares) | shares 78
Options outstanding, weighted average remaining contractual life (Year) 7 years
Options outstanding, weighted average exercise price (in dollars per share) $ 20.29
Options exercisable, number of shares (in shares) | shares 78
Options exercisable, weighted average exercise price (in dollars per share) $ 20.29
Range 06 [Member]  
Range of exercise prices, minimum (in dollars per share) 20.36
Range of exercise prices, maximum (in dollars per share) $ 20.36
Options outstanding, number of shares (in shares) | shares 3
Options outstanding, weighted average remaining contractual life (Year) 6 years 321 days
Options outstanding, weighted average exercise price (in dollars per share) $ 20.36
Options exercisable, number of shares (in shares) | shares 2
Options exercisable, weighted average exercise price (in dollars per share) $ 20.36
Range 07 [Member]  
Range of exercise prices, minimum (in dollars per share) 22.20
Range of exercise prices, maximum (in dollars per share) $ 22.20
Options outstanding, number of shares (in shares) | shares 82
Options outstanding, weighted average remaining contractual life (Year) 6 years 339 days
Options outstanding, weighted average exercise price (in dollars per share) $ 22.20
Options exercisable, number of shares (in shares) | shares 57
Options exercisable, weighted average exercise price (in dollars per share) $ 22.20
Range 08 [Member]  
Range of exercise prices, minimum (in dollars per share) 22.75
Range of exercise prices, maximum (in dollars per share) $ 22.75
Options outstanding, number of shares (in shares) | shares 481
Options outstanding, weighted average remaining contractual life (Year) 7 years 54 days
Options outstanding, weighted average exercise price (in dollars per share) $ 22.75
Options exercisable, number of shares (in shares) | shares 481
Options exercisable, weighted average exercise price (in dollars per share) $ 22.75
Range 09 [Member]  
Range of exercise prices, minimum (in dollars per share) 23.51
Range of exercise prices, maximum (in dollars per share) $ 23.51
Options outstanding, number of shares (in shares) | shares 108
Options outstanding, weighted average remaining contractual life (Year) 7 years 299 days
Options outstanding, weighted average exercise price (in dollars per share) $ 23.51
Options exercisable, number of shares (in shares) | shares 36
Options exercisable, weighted average exercise price (in dollars per share) $ 23.51
Range 10 [Member]  
Range of exercise prices, minimum (in dollars per share) 24.07
Range of exercise prices, maximum (in dollars per share) $ 24.07
Options outstanding, number of shares (in shares) | shares 7
Options outstanding, weighted average remaining contractual life (Year) 7 years 259 days
Options outstanding, weighted average exercise price (in dollars per share) $ 24.07
Options exercisable, number of shares (in shares) | shares 7
Options exercisable, weighted average exercise price (in dollars per share) $ 24.07