Share-Based Compensation (Detail Textuals) - USD ($) |
12 Months Ended | |
|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Share based compensation, total fair value of shares vested | $ 1,000 | $ 780,000 |
| Option valuation method used | Black-Scholes option-pricing model | |
| Share-based compensation expense | $ 708,000 | $ 784,000 |
| Share based compensation, unrecognized cost related to nonvested | $ 200,000 | |
| 2008 Long-Term Incentive Plan | Class A common stock | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Maximum number of shares authorized to be granted | 52,536 | |
| Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | 7 years | |