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Shareholders' Equity Total compensation cost related to nonvested awards (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Stock Issued During Period, Shares, Restricted Stock Award, Gross | 126,849 | 92,800
weighted average estimated fair value of restricted stock | $ 5.50 | $ 26.82
Stock Issued During Period, Value, Restricted Stock Award, Gross | $ 698,100 | $ 2,488,600
Restricted Stock [Member] |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Unrecognized compensation cost | $ 382,300 |
Excepted weighted-average period in years of compensation cost to be recognized | 1 year 9 months 4 days |
Stock Option [Member] |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Unrecognized compensation cost | $ 1,245,500 |
Excepted weighted-average period in years of compensation cost to be recognized | 1 year 9 months 18 days |

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