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Shareholders' Equity Total compensation cost related to nonvested awards (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Stock Issued During Period, Shares, Restricted Stock Award, Gross | 928,000 | 917,907
weighted average estimated fair value of restricted stock | $ 2.68 | $ 5.44
Stock Issued During Period, Value, Restricted Stock Award, Gross | $ 2,488,600 | $ 4,996,300
Restricted Stock [Member] |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Unrecognized compensation cost | $ 332,000 |
Excepted weighted-average period in years of compensation cost to be recognized | 1 year 11 months 12 days |
Warrant [Member] |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Unrecognized compensation cost | $ 0 |
Excepted weighted-average period in years of compensation cost to be recognized | 0 days |
Stock Option [Member] |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Unrecognized compensation cost | $ 3,078,600 |
Excepted weighted-average period in years of compensation cost to be recognized | 3 years 2 months 1 day |

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