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Revenue Recognition, Statement of Cash Flows (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities [Abstract]                      
Net income $ (2,765,000) $ (3,102,000) $ 3,513,000 $ (5,495,000) $ 8,376,000 $ (2,527,000) $ 5,595,000 $ 7,820,000 $ (7,849,000) $ 19,264,000 $ 38,735,000
Adjustments to reconcile net income to net cash used in operating activities:                      
Amortization of core premiums paid to customers                 4,127,000 3,588,000 3,232,000
Deferred income taxes                 (3,063,000) 1,548,000 6,840,000
Accounts receivable                 10,214,000 (3,298,000) (9,319,000)
Inventory                 (76,213,000) (33,655,000) (20,713,000)
Prepaid expenses and other current assets                 234,000 (965,000) (1,307,000)
Other assets                 (299,000) (120,000) (304,000)
Long-term core inventory                   0 0
Contract assets, net                 (2,096,000) (25,028,000) (24,584,000)
Contract liabilities, net                 (11,894,000) 23,871,000 (11,182,000)
Accrued core payments                   0 0
Net cash used in operating activities                 $ (40,328,000) (13,944,000) (5,269,000)
As Revised [Member] | ASU 2014-09 [Member]                      
Cash flows from operating activities [Abstract]                      
Net income                   18,826,000 38,776,000
Adjustments to reconcile net income to net cash used in operating activities:                      
Amortization of core premiums paid to customers                   0 0
Deferred income taxes                   1,495,000 6,865,000
Accounts receivable                   10,854,000 (18,145,000)
Inventory                   (6,847,000) (10,058,000)
Prepaid expenses and other current assets                   (2,825,000) (3,251,000)
Other assets                   404,000 (4,364,000)
Long-term core inventory                   (46,978,000) (25,245,000)
Contract assets, net                   0 0
Contract liabilities, net                   0 0
Accrued core payments                   10,276,000 (3,180,000)
Net cash used in operating activities                   (13,944,000) (5,269,000)
Adoption of ASC 606 [Member] | ASU 2014-09 [Member]                      
Cash flows from operating activities [Abstract]                      
Net income                   438,000 (41,000)
Adjustments to reconcile net income to net cash used in operating activities:                      
Amortization of core premiums paid to customers                   3,588,000 3,232,000
Deferred income taxes                   53,000 (25,000)
Accounts receivable                   (14,152,000) 8,826,000
Inventory                   (26,808,000) (10,655,000)
Prepaid expenses and other current assets                   1,860,000 1,944,000
Other assets                   (524,000) 4,060,000
Long-term core inventory                   46,978,000 25,245,000
Contract assets, net                   (25,028,000) (24,584,000)
Contract liabilities, net                   23,871,000 (11,182,000)
Accrued core payments                   (10,276,000) 3,180,000
Net cash used in operating activities                   $ 0 $ 0