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Share Based Compensation Plan (Details)
 12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Summary of option activity under Company's Plan  
Shares Outstanding, beginning of year | shares 145,894
Shares Granted | shares
Shares Exercised | shares (42,517)
Shares Forfeited | shares (750)
Shares Expired | shares (10,127)
Shares Outstanding, end of year | shares 92,500
Shares Exercisable, end of year | shares 92,500
Weighted - Average Exercise Price, Outstanding, beginning of year | $ / shares $ 8.12
Weighted - Average Exercise Price, Granted | $ / shares
Weighted - Average Exerise Price, Exercised | $ / shares 9.83
Weighted - Average Exercise Price, Forfeited | $ / shares 6.98
Weighted - Average Exercise Price, Expired | $ / shares 11.50
Weighted - Average Exercise Price, Outstanding, end of year | $ / shares 6.97
Weighted - Average Exercise Price, Exercisable, end of year | $ / shares $ 6.97
Weighted - Average Remaining Contractual Term, Outstanding, end of year 2 years 1 month 13 days
Weighted - Average Remaining Contractual Term, Exercisable, end of year 2 years 1 month 13 days
Aggregate Intrinsic Value, Outstanding, end of year | $ $ 1,065,420
Aggregate Intrinsic Value, Exercisable, end of year | $ $ 1,065,420