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Revenue Recognition, Statement of Cash Flows (Details) - USD ($)
 3 Months Ended 9 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Cash flows 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)
Accounts receivable     8,432,000 (4,240,000)
Inventory     (49,431,000) (34,643,000)
Prepaid expenses and other current assets     1,398,000 (33,000)
Other assets     (129,000) (153,000)
Long-term core inventory       0
Contract assets, net     (4,027,000) (16,208,000)
Contract liabilities, net     (10,794,000) 41,175,000
Accrued core payments       0
Net cash used in operating activities     $ (20,328,000) (9,803,000)
As Revised [Member] | ASC 606 [Member]        
Cash flows from operating activities [Abstract]        
Net income   (2,650,000)   10,368,000
Deferred income taxes       (2,714,000)
Accounts receivable       23,127,000
Inventory       (11,162,000)
Prepaid expenses and other current assets       (1,576,000)
Other assets       (163,000)
Long-term core inventory       (38,361,000)
Contract assets, net       0
Contract liabilities, net       0
Accrued core payments       14,837,000
Net cash used in operating activities       (9,803,000)
Adoption of ASC 606 [Member] | ASC 606 [Member]        
Cash flows from operating activities [Abstract]        
Net income   $ 123,000   520,000
Deferred income taxes       284,000
Accounts receivable       (27,367,000)
Inventory       (23,481,000)
Prepaid expenses and other current assets       1,543,000
Other assets       10,000
Long-term core inventory       38,361,000
Contract assets, net       (16,208,000)
Contract liabilities, net       41,175,000
Accrued core payments       (14,837,000)
Net cash used in operating activities       $ 0