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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

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