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Stock Options, Stock Grants and New Stock Issues - Narrative (Details) |  |  |  |  |  |  |  | 12 Months Ended
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May 17, 2018 USD ($) shares | Feb. 07, 2018 $ / shares shares | May 18, 2017 USD ($) shares | Feb. 08, 2017 employees $ / shares shares | May 05, 2016 USD ($) employees $ / shares shares | Feb. 19, 2016 $ / shares shares | Feb. 10, 2015 $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Options granted, weighted average fair value (dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 6.44 | $ 6.41 | $ 6.24
Exercised (shares) |  |  |  |  |  |  |  | 85,440 | 25,632 |
Shares of common stock purchased (shares) |  |  |  |  |  |  |  |  |  | 29,500
Options exercisable (shares) |  |  |  |  |  |  |  | 49,127 |  |
Options exercisable, weighted average exercise price (dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 13.82 |  |
Share-based compensation expense | $ |  |  |  |  |  |  |  | $ 826,998 | $ 638,416 | $ 459,473
Issuance of shares of common stock from the treasury (shares) |  |  |  |  |  |  |  | 66,632 | 58,532 | 62,124
Stock Options |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Exercised (shares) |  |  |  |  |  |  |  | 85,440 | 25,632 | 0
Option exercises, aggregate exercise price | $ |  |  |  |  |  |  |  | $ 1,033,110 | $ 296,050 |
Shares of common stock purchased (shares) |  |  |  |  |  |  |  | 10,578 |  |
Cash received from previous employees | $ |  |  |  |  |  |  |  | $ 141,855 |  |
Options exercisable (shares) |  |  |  |  |  |  |  | 49,127 | 119,861 | 129,762
Options exercisable, weighted average exercise price (dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 13.82 | $ 12.45 | $ 12.12
Share-based compensation expense | $ |  |  |  |  |  |  |  | $ 46,529 | $ 80,966 | $ 135,085
Total unrecognized compensation cost | $ |  |  |  |  |  |  |  | $ 36,420 |  |
Share-based compensation, weighted average period of recognition |  |  |  |  |  |  |  | 1 year 21 days |  |
2011 Plan | Stock Options |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Options granted (shares) |  |  |  |  |  |  | 32,532 |  |  |
Options granted, weighted average exercise price (dollars per share) | $ / shares |  |  |  |  |  |  | $ 16.01 |  |  |
Options granted, weighted average fair value (dollars per share) | $ / shares |  |  |  |  |  |  | $ 6.39 |  |  |
Risk free interest rate |  |  |  |  |  |  | 2.00% |  |  |
Expected life |  |  |  |  |  |  | 7 years |  |  |
Expected volatility rate |  |  |  |  |  |  | 46.00% |  |  |
Expected dividend yield |  |  |  |  |  |  | 2.00% |  |  |
2005 Stock Awards Plan | Stock Options |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Annual vesting rate |  |  |  |  |  |  |  | 20.00% |  |
2005 Stock Awards Plan | Stock Awards |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based compensation expense | $ |  |  |  |  |  |  |  | $ 780,469 | 557,450 | 324,388
Total unrecognized compensation cost | $ |  |  |  |  |  |  |  | $ 1,077,095 |  |
Share-based compensation, weighted average period of recognition |  |  |  |  |  |  |  | 1 year 10 months 16 days |  |
Share-based compensation expense, period of recognition (years) |  |  |  |  |  |  |  | 60 months |  |
Share-based compensation expense, net of taxes | $ |  |  |  |  |  |  |  | $ 616,571 | $ 354,538 | $ 206,311
Share-based compensation expense, net of taxes, (dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0.07 | $ 0.04 | $ 0.02
2015 Stock Awards Plan | Stock Awards |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Annual vesting rate |  |  |  |  |  |  |  | 20.00% |  |
Number of shares authorized (shares) |  |  |  |  |  |  |  | 250,000 |  |
Expiration period for awards |  |  |  |  |  |  |  | 10 years |  |
Period after grant date, awards vesting begins |  |  |  |  |  |  |  | 1 year |  |
Granted (shares) |  | 65,527 |  | 44,687 | 42,193 | 50,062 |  |  |  |
Granted, weighted average grant date fair value (dollars per share) | $ / shares |  | $ 12.47 |  | $ 12.30 | $ 8.05 | $ 7.51 |  |  |  |
Vesting period |  |  |  | 3 years | 5 years |  |  |  |  |
Number of employees receiving grants | employees |  |  |  | 8 | 5 |  |  |  |  |
2015 Stock Awards Plan | Stock Awards | Minimum |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Annual vesting rate |  |  |  |  |  |  |  | 20.00% |  |
Number of shares authorized (shares) | 250,000 |  |  |  |  |  |  |  |  |
2015 Stock Awards Plan | Stock Awards | Maximum |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Annual vesting rate |  |  |  |  |  |  |  | 33.00% |  |
Number of shares authorized (shares) | 500,000 |  |  |  |  |  |  |  |  |
Non Employee Director |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Issuance of shares of common stock from the treasury (shares) | 14,857 |  | 24,209 |  | 40,991 |  |  |  |  |
Annual cash retainer fees | $ | $ 276,000 |  | $ 287,500 |  | $ 330,000 |  |  |  |  |
Restricted Stock | Non Employee Director |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum annual retainer percent |  |  |  |  |  |  |  | 100.00% |  |
May 5, 2016 | 2015 Stock Awards Plan | Stock Awards |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based compensation expense | $ |  |  |  |  |  |  |  | $ 75,756 |  |
February 8, 2017 | 2015 Stock Awards Plan | Stock Awards |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based compensation expense | $ |  |  |  |  |  |  |  | $ 67,180 |  |

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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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