Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Operating activities:
Net income	$ 1,359,000	$ 806,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	186,000	178,000
Provision for inventory reserves	0	405,000
Reversal of inventory reserves	(1,134,000)	(1,701,000)
Provision for sales returns and doubtful accounts	5,000	5,000
Stock based compensation	27,000	21,000
Loss on investments	0	193,000
Gain on sale of assets	0	(160,000)
Noncontrolling interest	(100,000)	0
Changes in assets and liabilities:
Accounts receivable	378,000	(126,000)
Inventories	1,204,000	2,305,000
Prepaid expenses and other current assets	39,000	(18,000)
Accounts payable	(52,000)	(510,000)
Accrued liabilities	124,000	11,000
Other assets and liabilities	16,000	4,000
Total adjustments	693,000	607,000
Net cash provided by operating activities	2,052,000	1,413,000
Investing activities:
Acquisition of property and equipment	(17,000)	(17,000)
Proceeds from sale of assets	0	200,000
Payment for investment in convertible securities	0	(186,000)
Net cash used for investing activities	(17,000)	(3,000)
Financing activities:
Borrowings on notes payable	163,000	0
Dividend payments	(840,000)	(717,000)
Proceeds from stock options exercised	85,000	126,000
Net cash used for financing activities	(592,000)	(591,000)
Impact of exchange rates on cash	(104,000)	0
Net increase in cash and cash equivalents	1,339,000	819,000
Cash and cash equivalents, beginning of period	5,313,000	4,494,000
Cash and cash equivalents, end of period	6,652,000	5,313,000
Supplemental disclosures of cash flow information:
Cash paid for interest	0	0
Cash paid for income taxes, net	$ 3,000	$ 3,000