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Impact on Previously Issued Financial Statements for the Correction of an Error, Revised Consolidated Statement of Shareholders' Equity (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Mar. 31, 2018
Consolidated Statement of Shareholders' Equity [Abstract]          
Balance at beginning of period     $ 78,510,000    
Net income $ (3,102,000) $ (2,527,000) (5,084,000) $ 10,888,000  
Balance at end of period $ 74,172,000   74,172,000   $ 78,510,000
Historical Misapplication of GAAP Related to Timing of Recognizing Certain Expenses Incurred in Connection with New Business [Member]          
Consolidated Statement of Shareholders' Equity [Abstract]          
Balance at beginning of period     77,768,000 58,942,000 58,942,000
Net income   (2,650,000)   10,368,000 18,826,000
Balance at end of period         77,768,000
Historical Misapplication of GAAP Related to Timing of Recognizing Certain Expenses Incurred in Connection with New Business [Member] | As Previously Reported [Member]          
Consolidated Statement of Shareholders' Equity [Abstract]          
Balance at beginning of period     66,606,000 50,290,000 50,290,000
Net income   (6,806,000)   7,121,000 16,316,000
Balance at end of period         66,606,000
Historical Misapplication of GAAP Related to Timing of Recognizing Certain Expenses Incurred in Connection with New Business [Member] | Adjustment [Member]          
Consolidated Statement of Shareholders' Equity [Abstract]          
Balance at beginning of period     $ 11,162,000 8,652,000 8,652,000
Net income   $ 4,156,000   $ 3,247,000 2,510,000
Balance at end of period         $ 11,162,000