CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows related to operating activities:
Net income/(loss)	$ 541,000	$ 1,898,000
Adjustments to reconcile net income to cash generated (used) by operating activities:
Depreciation and amortization	356,000	354,000
Stock based compensation	31,000	85,000
(Decrease)/Increase in allowance for doubtful accounts	58,000	75,000
Increase/(Decrease) in inventory reserve	36,000	69,000
Decrease in warranty reserve	4,000
Change in assets and liabilities:
Accounts receivable	(98,000)	80,000
Other receivables-ERC	(1,593,000)
Inventories	1,091,000	(3,383,000)
Prepaid income taxes	140,000	373,000
Other current assets	(420,000)	(87,000)
Accounts payable	146,000	72,000
Accrued employee compensation and benefit costs	499,000	145,000
Post retirement obligation	20,000	99,000
Other accrued liabilities	25,000	(102,000)
Net cash generated (used) by operating activities	836,000	(322,000)
Cash flows related to investing activities:
Capital expenditures - property, plant and equipment	(14,000)	(413,000)
Net cash used by investing activities	(14,000)	(413,000)
Cash flows related to financing activities:
Principal payments on long-term debt	(637,000)	(136,000)
Principal payments on equipment financing lease obligations	(85,000)	(73,000)
Proceeds from equipment note and equipment financing lease	384,000
Proceeds from the line of credit	500,000	750,000
Purchase of treasury shares	(81,000)	(100,000)
Net cash provided by financing activities	81,000	441,000
Net increase (decrease) in cash	903,000	(294,000)
Cash at beginning of year	5,935,000	2,029,000
Cash at end of year	$ 6,838,000	$ 1,735,000