Consolidated Statements of Cash Flows - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Net income (loss)	[1]	$ 3,980	$ (3,300)	[2],[3],[4]
Adjustments to reconcile net income (loss) from operations to net cash flows used in operating activities:
Depreciation and amortization		17,408	17,877	[2],[3]
(Credit) charge for asbestos-related costs		(2,226)	6,661	[3]
Deferred income tax expense		468	1,304	[3]
Difference between net periodic pension and other postretirement costs and contributions		(9,295)	(7,489)	[3]
Stock-based compensation		1,665	2,438	[3]
Non-cash provisions – net		(2,215)	2,193	[3]
Other – net		(729)	658	[3]
Changes in assets/liabilities:
Receivables		(11,626)	(8,268)	[3]
Inventories		(17,903)	(27,618)	[3]
Other assets		(3,943)	(5,918)	[3]
Insurance receivable – asbestos		10,708	13,312	[3]
Asbestos liability		(19,834)	(23,215)	[3]
Accounts payable		1,557	17,601	[3]
Accrued payrolls and employee benefits		3,892	2,048	[3]
Other liabilities		885	(4,150)	[3]
Net cash flows used in operating activities		(27,208)	(15,866)	[3]
Cash flows from investing activities:
Purchases of property, plant and equipment		(16,688)	(15,236)	[3]
Proceeds from sale of property, plant and equipment		17	229	[3]
Purchases of long-term marketable securities		(724)	(32)
Proceeds from sale of long-term marketable securities		1,088	304
Other – net		(1)	1	[3]
Net cash flows used in investing activities		(16,308)	(14,734)	[3]
Cash flows from financing activities:
Proceeds from revolving credit facility		44,000	32,244	[3]
Payments on revolving credit facility		(26,666)	(8,500)	[3]
Proceeds from sale and leaseback financing arrangement		20,000
Payments on sale and leaseback financing arrangements		(346)	(245)	[3]
Proceeds from equipment financing facility		6,388
Proceeds from related party debt		5,776
Repayment of related party debt		(5,776)	(1,056)	[3]
Repayment of debt		(645)	(864)	[3]
Proceeds from shareholder exercise of warrants		193	3,308	[3]
Debt and equity issuance costs		(337)	(485)	[3]
Net cash flows provided by financing activities		42,587	24,402	[3]
Effect of exchange rate changes on cash and cash equivalents		(673)	(307)	[3]
Net decrease in cash and cash equivalents		(1,602)	(6,505)	[3]
Cash and cash equivalents at beginning of year	[3]	10,337	16,842
Cash and cash equivalents at end of year		8,735	10,337	[3]
Supplemental disclosures of cash flow information:
Income tax payments (net of refunds)		896	1,633	[3]
Interest payments (net of amounts capitalized)		5,923	2,895	[3]
Non-cash investing and financing activities:
Purchases of property, plant and equipment in accounts payable		994	1,676	[3]
Finance lease right-of-use assets exchanged for lease liabilities		1,105	1,258	[3]
Operating lease right-of-use assets exchanged for lease liabilities		$ 194	$ 199	[3]

[1] Retained deficit as of January 1, 2021, net loss for 2021 and retained deficit as of December 31, 2021 were adjusted to include inventory costs using the FIFO basis of costing. See Note 2.   See Notes to Consolidated Financial Statements.

[2] Costs of products sold (excluding depreciation and amortization) and subsequent subtotals and totals along with net loss per share for 2021 were adjusted to include inventory costs using the FIFO basis of costing. See Note 2.

[3] Net loss and the change in inventories for 2021 were adjusted to include inventory costs using the FIFO basis of costing. See Note 2.   See Notes to Consolidated Financial Statements.

[4] Net loss for 2021 and subsequent subtotals and totals were adjusted to include inventory costs using the FIFO basis of costing. See Note 2