CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended				6 Months Ended		9 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2021	Dec. 31, 2020	Mar. 31, 2021
Cash flows from operating activities:
Net loss	$ (5,420)	$ (2,424)	$ (17,725)	$ (6,270)	$ (7,844)	$ (23,997)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization					12,328	14,349
Impairment of fixed assets	0		1,243		0	1,243
Postretirement Medical benefits gains					0	(14,577)
Deferred income taxes					0	13,472
Net gains from sales of assets					(4,429)	(549)
Net gains on derivative instruments					(7,952)	(2,093)
Other adjustments					2,808	1,776
Change in operating assets and liabilities:
Accounts receivable					(8,458)	(818)
Inventories					(11,634)	(13,209)
Derivative assets, net					8,201	1,761
Other assets					2,273	2,418
Accounts payable					8,237		$ 12,430
Accrued expenses and other					(2,125)	3,971
Net cash used in operating activities					(8,595)	(3,823)
Cash flows from investing activities:
Purchases of property, plant and equipment					(5,887)	(9,636)
Proceeds from sales of property, plant and equipment					8,175	1,926
Net cash provided by (used in) investing activities					2,288	(7,710)
Cash flows from financing activities:
Proceeds from Credit Facilities					4,000	21,150
Repayments on Credit Facilities					(4,000)	(61,150)
Payments of finance lease obligations					(23)	(9)
Payment of financing costs					(309)	(2,614)
Net cash used in financing activities					(332)	(42,623)
Net decrease in cash and cash equivalents and restricted cash					(6,639)	(54,156)
Cash and cash equivalents and restricted cash at beginning of period		$ 10,438		$ 60,013	10,438	60,013	$ 60,013
Cash and cash equivalents and restricted cash at end of period	$ 3,799		$ 5,857		3,799	5,857
Supplemental disclosure of non-cash investing and financing activities:
Non-cash additions to property, plant and equipment					406	380
Non-cash issuance of 401-K common stock					$ 134	185
Cumulative preferred dividends, undeclared and unpaid						$ 284