Note 7 - Stock-based Compensation - Stock Option Activity (Details)
|
9 Months Ended |
|
Sep. 30, 2016
USD ($)
$ / shares
shares
|
|---|
| Stock Option Plan 2001 [Member] | Employee Stock Option [Member] |
|
| Options outstanding, weighted average exercise price (in dollars per share) | $ / shares |
$ 2.95
|
| Options outstanding, weighted average remaining contractual term |
2 years 182 days
|
| Options outstanding, intrinsic value | $ |
$ 751,000
|
| Stock Option Plan 2001 [Member] |
|
| Options outstanding (in shares) |
192,893
|
| Options outstanding, weighted average exercise price (in dollars per share) | $ / shares |
$ 5.75
|
| Options forfeited (in shares) |
(55,800)
|
| Options forfeited, weighted average exercise price (in dollars per share) | $ / shares |
$ 12.61
|
| Options exercised (in shares) |
(34,000)
|
| Options exercised, weighted average exercise price (in dollars per share) | $ / shares |
$ 2.95
|
| Options outstanding (in shares) |
103,093
|
| Options exercisable at September 30, 2016 (in shares) |
103,093
|
| Options exercisable at September 30, 2016 (in dollars per share) | $ / shares |
$ 2.95
|
| Options exercisable, weighted average remaining contractual term |
2 years 182 days
|
| Options exercisable, intrinsic value | $ |
$ 751,000
|
| Options granted (in shares) |
55,800
|
| Stock Option Plan 2013 [Member] |
|
| Options outstanding (in shares) |
102,400
|
| Options outstanding, weighted average exercise price (in dollars per share) | $ / shares |
$ 6.32
|
| Options forfeited (in shares) |
(108,000)
|
| Options forfeited, weighted average exercise price (in dollars per share) | $ / shares |
$ 8.75
|
| Options exercised (in shares) |
(6,800)
|
| Options exercised, weighted average exercise price (in dollars per share) | $ / shares |
$ 6.32
|
| Options outstanding (in shares) |
203,600
|
| Options outstanding, weighted average exercise price (in dollars per share) | $ / shares |
$ 7.61
|
| Options outstanding, weighted average remaining contractual term |
6 years 182 days
|
| Options outstanding, intrinsic value | $ |
$ 535,000
|
| Options exercisable at September 30, 2016 (in shares) |
45,200
|
| Options exercisable at September 30, 2016 (in dollars per share) | $ / shares |
$ 6.32
|
| Options exercisable, weighted average remaining contractual term |
5 years 219 days
|
| Options exercisable, intrinsic value | $ |
$ 177,000
|
| Options granted (in shares) |
108,000
|
| Expected to vest (in shares) |
138,172
|
| Expected to vest, weighted average exercise price (in dollars per share) | $ / shares |
$ 7.98
|
| Expected to vest, weighted average remaining contractual term |
6 years 292 days
|
| Expected to vest, intrinsic value | $ |
$ 312,000
|