Condensed Consolidated Statements Of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Operating activities
Net loss	$ (2,610,000)	$ (8,270,000)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Inventories allowances	(86,000)	48,000
Amortize deferred finance and other assets	76	0
Depreciation and amortization	777,000	696,000
Share-based compensation expense-stock options	119,000	136,000
Share-based compensation expense-restricted stock units	132,000	241,000
Loss on investments	489,000	1,098,000
Changes in operating assets and liabilities:
Trade accounts receivable	1,427,000	1,710,000
Inventories	(719,000)	(5,568,000)
Prepaid expenses and other current assets	195,000	352,000
Other assets	(236,000)	(39,000)
ROU assets and lease liabilities	(24,000)	(17,000)
Accounts payable	(349,000)	3,921,000
Accrued compensation and related taxes	429,000	682,000
Accrued warranty expense	139,000	18,000
Deferred revenue	1,696,000	206,000
Accrued other expenses and other current liabilities	86,000	(521,000)
Net cash provided by (used in) operating activities	1,541,000	(5,307,000)
Investing activities
Purchases of property, plant, and equipment	(918,000)	(714,000)
Net cash used in investing activities	(918,000)	(714,000)
Financing activities
Proceeds from common stock issuance	50,000	0
Cash dividends paid	0	(1,011,000)
Proceeds from the credit facility and notes payable	40,660,000	2,488,000
Repayment of the credit facility and notes payable	(40,563,000)	(132,000)
Net cash provided by financing activities	147,000	1,345,000
Net change in cash and cash equivalents	770,000	(4,676,000)
Cash and cash equivalents, beginning of period	1,918,000	10,580,000
Cash and cash equivalents, end of period	2,688,000	5,904,000
Supplemental disclosure
Cash paid for interest	332,000	43,000
Non-cash financing activity
Common stock issued under restricted stock units	$ 57,000	$ 178,000