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Stock-Based Compensation (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Sep. 09, 2015
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Allocated Share-based Compensation Expense   $ 189,000 $ 667,000  
Adjustments to Additional Paid in Capital Reclassification Of Share Based Compensation To Liability     $ 311,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   146,000    
Deferred Compensation Arrangement with Individual, Shares Issued   0   5,643
Chief Executive Officer [Member]        
Stock Issued During Period, Shares, New Issues   181,535    
Stock Repurchased During Period, Shares   78,688    
Other Employees [Member]        
Restricted Stock or Unit Expense   $ 190,000    
Restricted Stock Units (RSUs) [Member]        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options   2,000,000    
Adjustments to Additional Paid in Capital Reclassification Of Share Based Compensation To Liability   351,000    
Restricted Stock Units (RSUs) [Member] | Other Employees [Member]        
Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition   $ 76,000    
2015 Stock Incentive Plan[Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent 100.00%      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 800,000