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EMPLOYEE STOCK OPTIONS, RESTRICTED STOCK AWARD PLAN AND 401(k) - Exercise Prices No Options Were Granted (Details) - April 20, 2017
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Issuances of options | shares 7,500
Exercise price of options | $ / shares $ 11.70