Note 13 - Stock Compensation Plans/Subsequent Event - Stock Option Plans (Details) - USD ($)
|
12 Months Ended |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
| Stock options outstanding, Shares (in shares) |
50,746
|
64,479
|
82,598
|
| Stock options outstanding, Weighted average exercise price (in dollars per share) |
$ 15.20
|
$ 15.87
|
$ 15.98
|
| Granted, Shares (in shares) |
0
|
|
|
| Granted, Weighted average exercise price (in dollars per share) |
|
|
|
| Exercised, Shares (in shares) |
|
|
|
| Exercised, Weighted average exercise price (in dollars per share) |
|
|
|
| Forfeited, Shares (in shares) |
(13,046)
|
(13,733)
|
(18,119)
|
| Forfeited, Weighted average exercise price (in dollars per share) |
$ 21.14
|
$ 18.33
|
$ 16.37
|
| Stock options outstanding, Shares (in shares) |
37,700
|
50,746
|
64,479
|
| Stock options outstanding, Weighted average exercise price (in dollars per share) |
$ 13.15
|
$ 15.20
|
$ 15.87
|
| Options exercisable at year end, Shares (in shares) |
37,700
|
50,746
|
64,479
|
| Options exercisable at year end, Weighted average exercise price (in dollars per share) |
$ 13.15
|
$ 15.20
|
$ 15.87
|
| Stock-based compensation expense, Shares |
|
|
|