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Impact on Previously Issued Financial Statements for the Correction of an Error, Revised Consolidated Balance Sheet (Details) - USD ($)
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
ASSETS [Abstract]        
Income tax receivable $ 10,009,000 $ 7,972,000    
Prepaid expenses and other current assets 9,296,000 8,608,000    
Long-term core inventory - net   0    
Long-term deferred income taxes 9,746,000 6,698,000    
Other assets 1,071,000 804,000    
TOTAL ASSETS 632,362,000 552,427,000    
LIABILITIES AND SHAREHOLDERS' EQUITY [Abstract]        
Accrued liabilities 14,604,000 12,048,000    
TOTAL LIABILITIES 352,607,000 265,547,000    
Retained earnings 71,407,000 78,510,000    
TOTAL SHAREHOLDERS' EQUITY 279,755,000 286,880,000    
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY $ 632,362,000 552,427,000    
Historical Misapplication of U.S. 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 $ 19,274,000
TOTAL SHAREHOLDERS' EQUITY   286,138,000    
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY   505,908,000    
Historical Misapplication of U.S. 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 11,825,000
TOTAL SHAREHOLDERS' EQUITY   274,976,000    
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY   494,497,000    
Historical Misapplication of U.S. 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 $ 7,449,000
TOTAL SHAREHOLDERS' EQUITY   11,162,000    
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY   $ 11,411,000