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Note 4 - Stock-based Compensation - Activity for Stock Options (Details)
 9 Months Ended
Sep. 30, 2017
$ / shares
shares
Outstanding (in shares) | shares 757,784
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 9.91
Granted (in shares) | shares 72,051
Granted, weighted average exercise price (in dollars per share) | $ / shares $ 8.85
Exercised (in shares) | shares 1,269
Exercised, weighted average exercise price (in dollars per share) | $ / shares $ 6.36
Forfeited (in shares) | shares 26,795
Forfeited, weighted average exercise price (in dollars per share) | $ / shares $ 13.45
Canceled or expired (in shares) | shares 10,204
Canceled or expired, weighted average exercise price (in dollars per share) | $ / shares $ 12.51
Outstanding (in shares) | shares 791,567
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 9.67