CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows related to operating activities:
Loss from continuing operations	$ (366,000)	$ (827,000)
Adjustments to reconcile net income loss to net cash provided by (used in) operating activities:
Depreciation and amortization	271,000	248,000
Stock based compensation	63,000	41,000
Increase (decrease) in allowance for credit losses	3,000	(13,000)
Increase (decrease) in inventory reserve	38,000	(9,000)
(Decrease) increase in warranty reserve	(59,000)	13,000
Deferred income taxes		2,000
Change in assets and liabilities:
Accounts receivable	1,589,000	(1,175,000)
Inventories	(769,000)	(885,000)
Prepaid and other current assets	(412,000)	(1,069,000)
Accounts payable	77,000	953,000
Accrued employee compensation and benefit costs	(164,000)	196,000
Post retirement obligations	24,000	39,000
Other accrued liabilities	118,000	69,000
Net cash provided by (used in) operating activities from continuing operations	413,000	(2,417,000)
Cash flows related to investing activities:
Purchase of property, plant and equipment	(152,000)	(299,000)
Net cash used in investing activities from continuing operations	(152,000)	(299,000)
Cash flows related to financing activities:
(Payments on) proceeds from line of credit, net	(94,000)	939,000
Principal payments on equipment financing lease obligations		(501,000)
Net cash (used in) provided by financing activities from continuing operations	(94,000)	438,000
Discontinued Operation
Cash used in operating activities	(126,000)	(363,000)
Net cash used in operating activities from discontinued operation	(126,000)	(363,000)
Net increase (decrease) in cash and restricted cash	41,000	(2,641,000)
Cash and restricted cash at beginning of period	245,000	3,812,000
Cash and restricted cash at end of period	$ 286,000	$ 1,171,000