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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Operating activities:    
Net income $ 1,370,000 $ 696,000
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 161,000 203,000
Provision for inventory reserves 180,000 180,000
Provision for sales returns and doubtful accounts 11,000 190,000
Stock based compensation 8,000 3,000
Loss on investments 185,000 162,000
Changes in assets and liabilities:    
Accounts receivable 66,000 (935,000)
Inventories 213,000 (115,000)
Prepaid expenses and other current assets 13,000 (7,000)
Accounts payable 124,000 (9,000)
Accrued liabilities (48,000) 20,000
Other assets and liabilities 11,000 0
Total adjustments 924,000 (308,000)
Net cash provided by operating activities 2,294,000 388,000
Investing activities:    
Acquisition of property & equipment (5,000) (37,000)
Investment in securities 0 (93,000)
Net cash used for investing activities (5,000) (130,000)
Financing activities:    
Payments on notes payable (500,000) (500,000)
Dividend payments (589,000) (554,000)
Proceeds from stock options exercised 60,000 40,000
Net cash used for financing activities (1,029,000) (1,014,000)
Impact of exchange rates on cash (16,000) (12,000)
Net increase (decrease) in cash and cash equivalents 1,244,000 (768,000)
Cash and cash equivalents, beginning of period 3,250,000 4,018,000
Cash and cash equivalents, end of period 4,494,000 3,250,000
Supplemental disclosures of cash flow information:    
Cash paid for interest 9,000 43,000
Cash paid for income taxes, net $ 3,000 $ 3,000