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Note 11 - Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2015
Notes Tables |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | 20 15 |  |  | 20 14 |  |  | 20 13 |
|  |  |  |  |  | Weighted |  |  |  |  |  |  | Weighted |  |  |  |  |  |  | Weighted |
|  |  |  |  |  | Average |  |  |  |  |  |  | Average |  |  |  |  |  |  | Average |
|  | Option |  |  | Exercise |  |  | Option |  |  | Exercise |  |  | Option |  |  | Exercise |
|  | Shares |  |  | Price |  |  | Shares |  |  | Price |  |  | Shares |  |  | Price |
Outstanding at January 1 |  |  | 72,400 |  |  | $ | 5.16 |  |  |  | 84,600 |  |  | $ | 5.04 |  |  |  | 121,600 |  |  | $ | 4.53 |
Granted |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 12,000 |  |  |  | 6.87 |
Forfeited or expired |  |  | (2,000 | ) |  |  | 4.96 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Exchanged |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Exercised |  |  | (2,000 | ) |  |  | 4.96 |  |  |  | (12,200 | ) |  |  | 4.32 |  |  |  | (49,000 | ) |  |  | 4.23 |
Outstanding at December 31 |  |  | 68,400 |  |  | $ | 5.17 |  |  |  | 72,400 |  |  | $ | 5.16 |  |  |  | 84,600 |  |  | $ | 5.04 |
Exercisable at end of year |  |  | 68,400 |  |  | $ | 5.17 |  |  |  | 72,400 |  |  | $ | 5.16 |  |  |  | 84,600 |  |  | $ | 5.04 |
Weighted-average fair value of options granted during year |  |  | n/a |  |  |  |  |  |  |  | n/a |  |  |  |  |  |  | $ | 0.97 |  |  |  |  |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] |
|  |  |  | Options Outstanding |  |  | Options Exercisable |
|  |  |  |  |  |  |  | Weighted |  |  | Weighted |  |  |  |  |  |  | Weighted |  |  | Weighted |
|  |  |  |  |  |  |  | Average |  |  | Average |  |  |  |  |  |  | Average |  |  | Average |
|  |  |  | Option |  |  | Exercise |  |  | Maturity |  |  | Option |  |  | Exercise |  |  | Maturity |
Exercise Price Range |  | Shares |  |  | Price |  |  | (Years) |  |  | Shares |  |  | Price |  |  | (Years) |
$4.27 | to | $4.41 |  |  | 23,400 |  |  | $ | 4.39 |  |  |  | 5.01 |  |  |  | 23,400 |  |  | $ | 4.39 |  |  |  | 5.01 |
$4.80 | to | $4.96 |  |  | 12,000 |  |  |  | 4.80 |  |  |  | 5.28 |  |  |  | 12,000 |  |  |  | 4.80 |  |  |  | 5.28 |
$5.30 | to | $6.87 |  |  | 33,000 |  |  |  | 5.86 |  |  |  | 6.35 |  |  |  | 33,000 |  |  |  | 5.86 |  |  |  | 6.35 |
|  |  |  |  | 68,400 |  |  | $ | 5.17 |  |  |  | 5.70 |  |  |  | 68,400 |  |  | $ | 5.17 |  |  |  | 5.70 |
Schedule of Share-based Compensation, Activity [Table Text Block] |
|  | 2015 |  |  | 2014 |  |  | 2013 |
Weighted average grant-date fair value of stock options granted |  |  | n/a |  |  |  | n/a |  |  | $ | 0.97 |
Total fair value of stock options vested |  |  | n/a |  |  |  | n/a |  |  | $ | 11,686 |
Total intrinsic value of stock options exercised |  | $ | 2,953 |  |  | $ | 14,816 |  |  | $ | 113,790 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 201 5 |  |  | 2014 |  |  | 2013 |
Volatility |  |  | n/a |  |  |  | n/a |  |  |  | 19.1 | %
Expected option life |  |  | n/a |  |  |  | n/a |  |  |  | 3 |
Interest rate (risk free) |  |  | n/a |  |  |  | n/a |  |  |  | 0.80 | %
Dividends |  |  | n/a |  |  |  | n/a |  |  | None |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] |
|  | Shares |  |  | Grant Fair Value |
Balance, January 1, 2014 |  |  | - |  |  |  | - |
Granted |  |  | 34,601 |  |  | $ | 8.96 |
Forfeited |  |  | - |  |  |  | - |
Vested |  |  | - |  |  |  | - |
Balance, December 31, 2014 |  |  | 34,601 |  |  | $ | 8.96 |
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 |
Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block] |
2016 |  | $ | 155,009 |
2017 |  |  | 155,009 |
2018 |  |  | 87,191 |
2019 |  |  | 9,688 |

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- Definition Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value. + References No definition available. + Details
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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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