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Impact on Previously Issued Financial Statements for the Correction of an Error, Revised Consolidated Balance Sheet (Details) - USD ($)
Dec. 31, 2018
Mar. 31, 2018
Mar. 31, 2017
ASSETS [Abstract]      
Income tax receivable $ 12,887,000 $ 7,972,000  
Prepaid expenses and other current assets 7,946,000 8,608,000  
Long-term core inventory - net   0  
Long-term deferred income taxes 7,607,000 6,698,000  
Other assets 891,000 804,000  
TOTAL ASSETS 605,849,000 552,427,000  
LIABILITIES AND SHAREHOLDERS' EQUITY [Abstract]      
Accrued liabilities 13,382,000 12,048,000  
TOTAL LIABILITIES 326,061,000 265,547,000  
Retained earnings 74,172,000 78,510,000  
TOTAL SHAREHOLDERS' EQUITY 279,788,000 286,880,000  
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY $ 605,849,000 552,427,000  
Historical Misapplication of GAAP Related to Timing of Recognizing Certain Expenses Incurred in Connection with New Business [Member]      
ASSETS [Abstract]      
Income tax receivable   7,972,000  
Prepaid expenses and other current assets   15,104,000  
Long-term core inventory - net   298,294,000  
Long-term deferred income taxes   6,937,000  
Other assets   21,995,000  
TOTAL ASSETS   505,908,000  
LIABILITIES AND SHAREHOLDERS' EQUITY [Abstract]      
Accrued liabilities   12,048,000  
TOTAL LIABILITIES   219,770,000  
Retained earnings   77,768,000 $ 58,942,000
TOTAL SHAREHOLDERS' EQUITY   286,138,000  
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY   505,908,000  
Historical Misapplication of GAAP Related to Timing of Recognizing Certain Expenses Incurred in Connection with New Business [Member] | As Previously Reported [Member]      
ASSETS [Abstract]      
Income tax receivable   7,796,000  
Prepaid expenses and other current assets   11,491,000  
Long-term core inventory - net   301,656,000  
Long-term deferred income taxes   10,556,000  
Other assets   7,392,000  
TOTAL ASSETS   494,497,000  
LIABILITIES AND SHAREHOLDERS' EQUITY [Abstract]      
Accrued liabilities   11,799,000  
TOTAL LIABILITIES   219,521,000  
Retained earnings   66,606,000 50,290,000
TOTAL SHAREHOLDERS' EQUITY   274,976,000  
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY   494,497,000  
Historical Misapplication of GAAP Related to Timing of Recognizing Certain Expenses Incurred in Connection with New Business [Member] | Adjustment [Member]      
ASSETS [Abstract]      
Income tax receivable   176,000  
Prepaid expenses and other current assets   3,613,000  
Long-term core inventory - net   (3,362,000)  
Long-term deferred income taxes   (3,619,000)  
Other assets   14,603,000  
TOTAL ASSETS   11,411,000  
LIABILITIES AND SHAREHOLDERS' EQUITY [Abstract]      
Accrued liabilities   249,000  
TOTAL LIABILITIES   249,000  
Retained earnings   11,162,000 $ 8,652,000
TOTAL SHAREHOLDERS' EQUITY   11,162,000  
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY   $ 11,411,000