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Note 11 - Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | 20 16 |  |  | 20 15 |  |  | 20 14 |
|  |  |  |  |  | Weighted |  |  |  |  |  |  | Weighted |  |  |  |  |  |  | Weighted |
|  |  |  |  |  | Average |  |  |  |  |  |  | Average |  |  |  |  |  |  | Average |
|  | Option |  |  | Exercise |  |  | Option |  |  | Exercise |  |  | Option |  |  | Exercise |
|  | Shares |  |  | Price |  |  | Shares |  |  | Price |  |  | Shares |  |  | Price |
Outstanding at January 1 |  |  | 68,400 |  |  | $ | 5.17 |  |  |  | 72,400 |  |  | $ | 5.16 |  |  |  | 84,600 |  |  | $ | 5.04 |
Granted |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Forfeited or expired |  |  | (12,000 | ) |  |  | 5.30 |  |  |  | (2,000 | ) |  |  | 4.96 |  |  |  | - |  |  |  | - |
Exchanged |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Exercised |  |  | - |  |  |  | - |  |  |  | (2,000 | ) |  |  | 4.96 |  |  |  | (12,200 | ) |  |  | 4.32 |
Outstanding at December 31 |  |  | 56,400 |  |  | $ | 5.14 |  |  |  | 68,400 |  |  | $ | 5.17 |  |  |  | 72,400 |  |  | $ | 5.16 |
Exercisable at end of year |  |  | 56,400 |  |  | $ | 5.14 |  |  |  | 68,400 |  |  | $ | 5.17 |  |  |  | 72,400 |  |  | $ | 5.16 |
Weighted-average fair value of options granted during year |  |  | n/a |  |  |  |  |  |  |  | n/a |  |  |  |  |  |  |  | n/a |  |  |  |  |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] |
|  |  |  |  | Options Outstanding & Exercisable |
|  |  |  |  |  |  |  |  | Weighted |  |  | Weighted |
|  |  |  |  |  |  |  |  | Average |  |  | Average |
|  |  |  |  | Option |  |  | Exercise |  |  | Maturity |
Exercise Price Range |  |  | Shares |  |  | Price |  |  | (Years) |
| $4.41 |  |  |  |  | 20,400 |  |  | $ | 4.41 |  |  |  | 3.77 |
| $4.80 |  |  |  |  | 9,000 |  |  |  | 4.80 |  |  |  | 4.22 |
$5.30 | to | $6.87 |  |  |  | 27,000 |  |  |  | 5.81 |  |  |  | 4.95 |
|  |  |  |  |  | 56,400 |  |  | $ | 5.14 |  |  |  | 4.41 |
Schedule of Share-based Compensation, Activity [Table Text Block] |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Weighted average grant-date fair value of stock options granted |  |  | n/a |  |  |  | n/a |  |  |  | n/a |
Total fair value of stock options vested |  |  | n/a |  |  |  | n/a |  |  |  | n/a |
Total intrinsic value of stock options exercised |  | $ | - |  |  | $ | 2,953 |  |  | $ | 14,816 |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] |
|  | Shares |  |  | Grant Fair Value |
Balance, January 1, 2015 |  |  | 34,601 |  |  | $ | 8.96 |
Granted |  |  | 34,484 |  |  |  | 8.99 |
Forfeited |  |  | - |  |  |  | - |
Vested |  |  | (8,652 | ) |  |  | 8.96 |
Balance, December 31, 2015 |  |  | 60,433 |  |  | $ | 8.97 |
Balance, January 1, 2016 |  |  | 60,433 |  |  | $ | 8.97 |
Granted |  |  | 33,685 |  |  |  | 7.14 |
Forfeited |  |  | (8,187 | ) |  |  | 8.97 |
Vested |  |  | (20,784 | ) |  |  | 8.97 |
Balance, December 31, 2016 |  |  | 65,147 |  |  | $ | 8.03 |
Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block] |
2017 |  | $ | 173,136 |
2018 |  |  | 123,693 |
2019 |  |  | 67,190 |
2020 |  |  | 10,021 |

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