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Note 9 - Share-based Compensation - Stock Option Activity (Details)
 6 Months Ended
Jun. 30, 2019
$ / shares
shares
Stock options outstanding, beginning of period (in shares) | shares 608,485
Balance, weighted average exercise price, beginning of period (in dollars per share) | $ / shares $ 25.16
Stock options granted (in shares) | shares 14,000
Stock options granted, weighted average exercise price (in dollars per share) | $ / shares $ 10.05
Stock options exercised (in shares) | shares
Stock options exercised, weighted average exercise price (in dollars per share) | $ / shares
Stock options canceled (in shares) | shares (4,119)
Stock options canceled, weighted average exercise price (in dollars per share) | $ / shares $ 45.10
Balance, June 30, 2019 (in shares) | shares 618,366
Balance, June 30, 2019 (in dollars per share) | $ / shares $ 24.75
Exercisable and vested (in shares) | shares 362,368
Exercisable and vested, weighted average exercise price (in dollars per share) | $ / shares $ 24.57