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Impact on Previously Issued Financial Statements for the Correction of an Error, Revised Consolidated Statement of Cash Flow from Operating Activities (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 Cash Flow from Operating Activities [Abstract]          
Net income $ (3,102,000) $ (2,527,000) $ (5,084,000) $ 10,888,000  
Deferred income taxes     (962,000) (2,430,000)  
Income tax receivable     (4,921,000) (69,000)  
Prepaid expenses and other current assets     1,398,000 (33,000)  
Other assets     (129,000) (153,000)  
Accounts payable and accrued liabilities     27,968,000 (15,946,000)  
Long-term core inventory       0  
Net cash used in operating activities     $ (20,328,000) (9,803,000)  
Historical Misapplication of GAAP Related to Timing of Recognizing Certain Expenses Incurred in Connection with New Business [Member]          
Consolidated Statement of Cash Flow from Operating Activities [Abstract]          
Net income   (2,650,000)   10,368,000 $ 18,826,000
Deferred income taxes       (2,714,000) 1,495,000
Income tax receivable         (6,312,000)
Prepaid expenses and other current assets       (1,645,000) (2,825,000)
Other assets       (163,000) 404,000
Accounts payable and accrued liabilities       (15,946,000) (11,671,000)
Long-term core inventory       (38,361,000) (46,978,000)
Net cash used in operating activities       (9,803,000) (13,944,000)
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 Cash Flow from Operating Activities [Abstract]          
Net income   (6,806,000)   7,121,000 16,316,000
Deferred income taxes       (909,000) 3,055,000
Income tax receivable         (6,081,000)
Prepaid expenses and other current assets       (2,093,000) (2,507,000)
Other assets       289,000 (384,000)
Accounts payable and accrued liabilities       (15,647,000) (11,621,000)
Long-term core inventory       (37,222,000) (45,839,000)
Net cash used in operating activities       (9,803,000) (13,944,000)
Historical Misapplication of GAAP Related to Timing of Recognizing Certain Expenses Incurred in Connection with New Business [Member] | Adjustment [Member]          
Consolidated Statement of Cash Flow from Operating Activities [Abstract]          
Net income   $ 4,156,000   3,247,000 2,510,000
Deferred income taxes       (1,805,000) (1,560,000)
Income tax receivable         (231,000)
Prepaid expenses and other current assets       448,000 (318,000)
Other assets       (452,000) 788,000
Accounts payable and accrued liabilities       (299,000) (50,000)
Long-term core inventory       (1,139,000) (1,139,000)
Net cash used in operating activities       $ 0 $ 0