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Related Party Transactions (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2015
Dec. 31, 2017
Apr. 18, 2017
Emmett J. Wood [Member]          
Related Party Transaction [Line Items]          
Compensation to related parties $ 181,000 $ 188,000      
Emmett J. Wood [Member] | Class A Common Stock [Member]          
Related Party Transaction [Line Items]          
Number of shares held by related party (in shares) 810,000        
Emmett J. Wood [Member] | Class B Common Stock [Member]          
Related Party Transaction [Line Items]          
Number of shares held by related party (in shares) 50,000        
Porter [Member]          
Related Party Transaction [Line Items]          
Proceeds from related party, debt     $ 2,500,000    
Interest expense, related party $ 75,000 $ 74,000      
Debt instrument, fixed interest rate   12.00%     6.00%
Debt instrument, first interest payment due date Aug. 20, 2015        
Debt instrument, last principal and interest payment date Jul. 25, 2022 Jul. 01, 2017      
Gain on extinguishment of subordinated debt       $ 1,000,000  
Porter [Member] | Class A Common Stock [Member]          
Related Party Transaction [Line Items]          
Percentage of shares owned         34.90%