Note 15 - Stock-based Compensation Plan - Restricted Stock Units Performance Targets (Details) - Restricted Stock Units (RSUs) [Member]
|
12 Months Ended |
|
Dec. 31, 2016
$ / shares
|
|---|
| Vesting Scenario One [Member] |
|
| Two Year Cumulative Fully Diluted EPS for the Two Year Performance Period Ending December 31, 2017 (in dollars per share) |
$ 1.21
|
| Percent of Target Achieved |
100.00%
|
| Percent RSUs Vested |
100.00%
|
| Vesting Scenario Two [Member] |
|
| Two Year Cumulative Fully Diluted EPS for the Two Year Performance Period Ending December 31, 2017 (in dollars per share) |
$ 1.15
|
| Percent of Target Achieved |
95.00%
|
| Percent RSUs Vested |
83.00%
|
| Vesting Scenario Three [Member] |
|
| Two Year Cumulative Fully Diluted EPS for the Two Year Performance Period Ending December 31, 2017 (in dollars per share) |
$ 1.09
|
| Percent of Target Achieved |
90.00%
|
| Percent RSUs Vested |
67.00%
|
| Vesting Scenario Four [Member] |
|
| Two Year Cumulative Fully Diluted EPS for the Two Year Performance Period Ending December 31, 2017 (in dollars per share) |
$ 1.03
|
| Percent of Target Achieved |
85.00%
|
| Percent RSUs Vested |
50.00%
|
| Vesting Scenario Five [Member] |
|
| Two Year Cumulative Fully Diluted EPS for the Two Year Performance Period Ending December 31, 2017 (in dollars per share) |
|
| Percent of Target Achieved |
|
| Percent RSUs Vested |
0.00%
|