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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Operating activities:    
Net income $ 806,000 $ 1,370,000
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 178,000 161,000
Provision for inventory reserves 405,000 180,000
Reversal of inventory reserves (1,701,000) (838,000)
Provision for sales returns and doubtful accounts 5,000 11,000
Stock based compensation 21,000 8,000
Loss on investments 193,000 185,000
Gain on sale of assets (160,000) 0
Changes in assets and liabilities:    
Accounts receivable (126,000) 66,000
Inventories 2,305,000 1,051,000
Prepaid expenses and other current assets (18,000) 13,000
Accounts payable (510,000) 124,000
Accrued liabilities 11,000 (48,000)
Other assets and liabilities 4,000 11,000
Total adjustments 607,000 924,000
Net cash provided by operating activities 1,413,000 2,294,000
Investing activities:    
Acquisition of property and equipment (17,000) (5,000)
Proceeds from sale of assets 200,000 0
Payment for investment in convertible securities (186,000) 0
Net cash used for investing activities (3,000) (5,000)
Financing activities:    
Payments on notes payable 0 (500,000)
Dividend payments (717,000) (589,000)
Proceeds from stock options exercised 126,000 60,000
Net cash used for financing activities (591,000) (1,029,000)
Impact of exchange rates on cash 0 (16,000)
Net increase in cash and cash equivalents 819,000 1,244,000
Cash and cash equivalents, beginning of period 4,494,000 3,250,000
Cash and cash equivalents, end of period 5,313,000 4,494,000
Supplemental disclosures of cash flow information:    
Cash paid for interest 0 9,000
Cash paid for income taxes, net $ 3,000 $ 3,000