Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Cash flows used in operating activities
Net loss	$ (3,218,000)	$ (4,784,000)
Adjustments to reconcile net loss to net cash used in operating activities
Gain on settlement of debt
Deferred tax benefits	(109,000)	(109,000)
Unrealized (gain) loss on the fair value of investments in bonds held to maturity	(145,000)	63,000
Accretion of bond discount	(10,000)	(137,000)
Stock-based compensation	682,000	1,257,000
Stock issuance commitments
Provision for bad debt	104,000	38,000
Recovery of bad debt	(68,000)	(6,000)
Inventory valuation adjustments	434,000	304,000
Amortization of right-of-use assets, operating assets	229,000	135,000
Depreciation and amortization	690,000	602,000
Changes in assets and liabilities
Accounts receivable	(784,000)	323,000
Inventories	(978,000)	(1,196,000)
Prepaid expenses and other current assets	(229,000)	(619,000)
Accounts payable	988,000	708,000
Accrued expenses	92,000	68,000
Accrued director’s compensation	160,000
Operating lease obligations	(303,000)	(222,000)
Customer deposits and deferred revenue	771,000	381,000
Net cash used in operating activities	(1,694,000)	(3,194,000)
Cash flows used in investing activities
Cash used for investments held to maturity	(949,000)	(10,763,000)
Proceeds from bond redemption	950,000
Cash used for property and equipment	(342,000)	(421,000)
Net cash used in investing activities	(341,000)	(11,184,000)
Cash flows used in financing activities
Principal payments made on notes payable	(114,000)	(213,000)
Net cash used in financing activities	(114,000)	(213,000)
Effect of exchange rate changes on cash	(684,000)	(63,000)
Net decrease in cash and cash equivalents	(2,833,000)	(14,654,000)
Cash and cash equivalents, beginning of the period	8,482,000	25,627,000
Cash and cash equivalents, end of the period	5,649,000	10,973,000
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	6,000	6,000
Supplemental disclosure of non-cash information:
Notes payable	510,000	523,000
Common stock issued in connection with:
Compensation awards previously accrued	160,000	200,000
ROU assets and operating lease obligations recognized (Note 8):
Operating lease assets recognized	484,000
Less: non-cash changes to operating lease assets amortization	(229,000)	(135,000)
ROU assets and operating lease obligations recognized	255,000	(135,000)
Operating lease liabilities recognized	484,000
Less: non-cash changes to operating lease liabilities accretion	(303,000)	(222,000)
Operating lease liabilities recognized	$ 181,000	$ (222,000)