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Subordinated Debenture (Details Textual) - USD ($) |  | 6 Months Ended
--- | --- | ---
Jun. 28, 2013 | Jun. 30, 2015
Warrants issued to purchase common stock (in shares) | 48,750 |
Common stock exercise price (in dollars per share) | $ 19.33 |
Volume-weighted average share price, period (in days) | 20 days |
Weighted average share price (in dollars per share) | $ 30.00 |
Warrant exercise price description |  | The warrant will become exercisable on June 28, 2014, and, unless previously exercised, will expire on June 28, 2021. The Company has the right to force an exercise of the warrant after the debenture has been repaid in full if the 20-day volume-weighted average price of a share of its common stock exceeds $30.00.
Fair value of warrants | $ 300,000 |
Risk free interest rate (as a percent) | 0.66% |
Expected dividend rate (as a percent) | 1.19% |
Expected volatility rate (as a percent) | 34.00% |
Expected term (in years) | 3 years |
Subordinated Debt |  |
Subordinated debenture, principal amount | $ 3,000,000 |
Fixed annual interest rate (as a percent) | 8.00% |
Subordinated debenture, maturity date | Jun. 28, 2021 |
Subordinated debenture, maturity date range, start | Jun. 28, 2016 |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 + Details
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