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Stockholders' Equity (Details Textual) |  |  | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 03, 2016 USD ($) $ / shares shares | Jan. 06, 2016 USD ($) $ / shares | Oct. 28, 2015 USD ($) | Jun. 30, 2010 shares | Jun. 30, 2000 shares | Jun. 30, 2016 USD ($) Employee $ / shares shares | Jun. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) Employee $ / shares shares | Dec. 31, 2014 USD ($) Employee $ / shares shares | Dec. 31, 2013 $ / shares | Jun. 30, 2001 shares
Stockholders' Equity (Textual) |  |  |  |  |  |  |  |  |  |  |
Potential issuance or sale of equity | $ |  |  | $ 10,000,000 |  |  |  |  |  |  |  |
Gross proceeds | $ | $ 5,900,000 | $ 5,958,000 |  |  |  |  |  |  |  |  |
Net proceeds | $ | $ 5,313,000 |  |  |  |  |  |  |  |  |  |
Common stock shares sold | 1,123,810 |  |  |  |  |  |  |  |  |  |
Sale of stock, per share | $ / shares | $ 5.25 |  |  |  |  |  |  |  |  |  |
Closing share price | $ / shares |  | $ 8.08 |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  |  |  |  |  | 10,000,000 |  | 8,000,000 |  |  |
Proceeds from exercise of stock options | $ |  |  |  |  |  | $ 3,150 | $ 45,140 |  |  |  |
Employee [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity (Textual) |  |  |  |  |  |  |  |  |  |  |
Common stock reserved for issuance under the plan |  |  |  |  |  | 270,000 |  |  |  |  |
Stock Option [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity (Textual) |  |  |  |  |  |  |  |  |  |  |
Exercise prices of options outstanding | $ / shares |  |  |  |  |  | $ 3.96 |  | $ 3.57 | $ 3.42 | $ 3.30 |
Aggregate intrinsic value of options exercised | $ |  |  |  |  |  | $ 4,000 |  | $ 110,000 | $ 1,000 |  |
Weighted-average grant date fair values of options granted | $ / shares |  |  |  |  |  | $ 3.57 |  | $ 3.46 | $ 2.26 |  |
Total unrecognized stock-based compensation related to non-vested stock options | $ |  |  |  |  |  | $ 211,178 |  |  |  |  |
Outstanding non-vested stock options cost expected to be recognized | $ |  |  |  |  |  | $ 41,476 |  |  |  |  |
Stock Option [Member] | 37,000 stock options granted [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity (Textual) |  |  |  |  |  |  |  |  |  |  |
Stock option granted during the period |  |  |  |  |  | 37,000 |  |  |  |  |
Stock Option [Member] | 16,000 stock options granted [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity (Textual) |  |  |  |  |  |  |  |  |  |  |
Stock option granted during the period |  |  |  |  |  |  |  | 16,000 |  |  |
Stock Option [Member] | 25,000 stock options granted [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity (Textual) |  |  |  |  |  |  |  |  |  |  |
Stock option granted during the period |  |  |  |  |  |  |  |  | 25,000 |  |
Stock Option [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity (Textual) |  |  |  |  |  |  |  |  |  |  |
Exercise prices of options outstanding | $ / shares |  |  |  |  |  | $ 1.70 |  |  |  |  |
Stock Option [Member] | Minimum [Member] | 37,000 stock options granted [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity (Textual) |  |  |  |  |  |  |  |  |  |  |
Exercise prices of options outstanding | $ / shares |  |  |  |  |  | 6.70 |  |  |  |  |
Stock Option [Member] | Minimum [Member] | 16,000 stock options granted [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity (Textual) |  |  |  |  |  |  |  |  |  |  |
Exercise prices of options outstanding | $ / shares |  |  |  |  |  |  |  | $ 6.05 |  |  |
Stock Option [Member] | Minimum [Member] | 25,000 stock options granted [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity (Textual) |  |  |  |  |  |  |  |  |  |  |
Exercise prices of options outstanding | $ / shares |  |  |  |  |  |  |  |  | $ 4.25 |  |
Stock Option [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity (Textual) |  |  |  |  |  |  |  |  |  |  |
Exercise prices of options outstanding | $ / shares |  |  |  |  |  | 7.54 |  |  |  |  |
Stock Option [Member] | Maximum [Member] | 37,000 stock options granted [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity (Textual) |  |  |  |  |  |  |  |  |  |  |
Exercise prices of options outstanding | $ / shares |  |  |  |  |  | $ 6.93 |  |  |  |  |
Stock Option [Member] | Maximum [Member] | 16,000 stock options granted [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity (Textual) |  |  |  |  |  |  |  |  |  |  |
Exercise prices of options outstanding | $ / shares |  |  |  |  |  |  |  | $ 7.54 |  |  |
Stock Option [Member] | Maximum [Member] | 25,000 stock options granted [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity (Textual) |  |  |  |  |  |  |  |  |  |  |
Exercise prices of options outstanding | $ / shares |  |  |  |  |  |  |  |  | $ 4.80 |  |
Stock Option [Member] | Employee [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity (Textual) |  |  |  |  |  |  |  |  |  |  |
Number of stock options exercised |  |  |  |  |  | 1,000 |  | 28,000 | 1,000 |  |
Proceeds from exercise of stock options | $ |  |  |  |  |  | $ 3,150 |  | $ 120,210 | $ 3,149 |  |
Number of employee exercised stock options | Employee |  |  |  |  |  | 1 |  | 11 | 1 |  |
2000 Plan [Member] | Stock Option [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity (Textual) |  |  |  |  |  |  |  |  |  |  |
Common stock reserved for issuance under the plan |  |  |  |  |  | 0 |  |  |  |  |
Number of stock options exercised |  |  |  |  |  | 0 |  | (26,000) | 0 |  |
Stock option granted during the period |  |  |  |  |  | 0 |  | 0 | 0 |  |
2000 Plan [Member] | Stock Option [Member] | Employee [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity (Textual) |  |  |  |  |  |  |  |  |  |  |
Stock option and incentive plan description |  |  |  |  | No less than 85% of fair market value on the date of grant in the case of non-qualified stock options. |  |  |  |  |  |
Common stock reserved for issuance under the plan |  |  |  |  | 250,000 |  |  |  |  |  | 500,000
Stock option expiration period |  |  |  |  | 10 years | 4 years 6 months |  |  |  |  |
Weighted average remaining life of options exercisable |  |  |  |  |  | 2 years 6 months |  |  |  |  |
2010 Plan [Member] | Stock Option [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity (Textual) |  |  |  |  |  |  |  |  |  |  |
Common stock reserved for issuance under the plan |  |  |  |  |  | 156,500 |  |  |  |  |
Number of stock options exercised |  |  |  |  |  | (1,000) |  | (2,000) | (1,000) |  |
Stock option granted during the period |  |  |  |  |  | 37,000 |  | 16,000 | 25,000 |  |
2010 Plan [Member] | Stock Option [Member] | Employee [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity (Textual) |  |  |  |  |  |  |  |  |  |  |
Stock option and incentive plan description |  |  |  | No less than 85% of fair market value on the date of grant in the case of non-qualified stock options. |  |  |  |  |  |  |
Common stock reserved for issuance under the plan |  |  |  | 300,000 |  |  |  |  |  |  |
Stock option expiration period |  |  |  | 10 years |  | 4 years 6 months |  |  |  |  |
Weighted average remaining life of options exercisable |  |  |  |  |  | 2 years 6 months |  |  |  |  |

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