CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Operating activities
Net loss	$ (11,633,000)	$ (1,701,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Allowance for doubtful accounts	170,000	0
Inventory allowance	81,000	700,000
Deferred tax expense	0	184,000
Depreciation and amortization	1,423,000	1,394,000
Share-based compensation expense -stock options	271,000	253,000
Share-based compensation expense-restricted stock units	404,000	306,000
Unrealized loss on investment	313,000	219,000
(Gain) on sale of equipment	(1,000)	(40,000)
Changes in operating assets and liabilities:
Trade accounts receivable	(2,557,000)	(1,763,000)
Inventories	(5,208,000)	(7,133,000)
Prepaid expenses and other current assets	56,000	244,000
Other assets	(45,000)	14,000
ROU Assets and Lease Liabilities	(38,000)	(23,000)
Accounts payable	7,015,000	764,000
Accrued compensation and related taxes	44,000	(536,000)
Accrued warranty expense	58,000	(258,000)
Deferred revenue	884,000	443,000
Accrued other expenses and other current liabilities	(237,000)	631,000
Net cash used in operating activities	(9,000,000)	(6,302,000)
Investing activities
Proceed from the sale of property, plant, and equipment	0	72,000
Purchases of property, plant and equipment	(1,750,000)	(2,416,000)
Net cash used in investing activities	(1,750,000)	(2,344,000)
Financing activities
Proceeds from issuance of common stock, net of costs	0	11,559
Dividends paid	(2,029,000)	(1,172,000)
Proceeds from credit facility and notes payable	9,722,000	5,743,000
Repayment of credit facility and notes payable	(5,605,000)	(3,730,000)
Net cash provided by financing activities	2,088,000	12,400,000
Net change in cash and cash equivalents	(8,662,000)	3,754,000
Cash and cash equivalents, beginning of year	10,580,000	6,826,000
Cash and cash equivalents, end of year	1,918,000	10,580,000
Supplemental disclosure
Interest paid	190,000	53,000
Non-cash financing activity
Common Stock issued under restricted stock units	$ 364,000	$ 298,000