Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Operating Activities
Net loss	$ (7,112)	$ (9,786)
Adjustments to reconcile net loss to net cash used for operating activities:
Depreciation	1,520	2,709
Net periodic costs and contributions related to employee benefit plans	(899)	(4,090)
Bad debt expense (benefit)	(65)	307
Deferred income taxes	11	(25)
Gain on short-term investments	(401)
Provision, interest and penalties for uncertain tax positions	(102)	9
Loss on sale/disposal of assets, net		58
Asset impairments		102
Changes in working capital and other operating assets and liabilities:
Accounts receivable	4,165	1,682
Inventories, prepaids and other current assets	1,545	(400)
Other assets	19	388
Accounts payable	(1,078)	(2,780)
Compensation and benefit obligations	(253)	(778)
Other accrued expenses	1,525	(170)
Contract liabilities	7	(1,088)
Other post-employment benefits	(56)	(71)
Net cash used for operating activities	(1,174)	(13,933)
Investing Activities
Purchases of assets	(1,148)	(1,627)
Purchases of short-term investments	(10,500)
Return on short-term investments	120
Note payment received for asset sales		22,400
Net cash provided by (used for) investing activities	(11,528)	20,773
Financing Activities
Dividends paid	(3,426)	(11,454)
Net cash used for financing activities	(3,426)	(11,454)
Net decrease in cash and cash equivalents	(16,128)	(4,614)
Cash and cash equivalents, beginning of period	27,825	32,439
Cash and cash equivalents, end of period	11,697	27,825
Supplemental Disclosures
Income tax paid, net	594	619
Noncash investing and financing activities:
Investments in property, plant and equipment payable	33
Dividends payable	$ 856	$ 856