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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Cash Flows From Operating Activities:    
Net income $ 613,000 $ 576,000
Adjustments to reconcile net income to net cash and cash equivalents used in operating activities:    
Stock-based compensation 136,000 109,000
Depreciation and amortization 243,000 244,000
Equity in income of unconsolidated affiliate (141,000) (138,000)
Non-cash lease expense 229,000 162,000
Changes in operating assets and liabilities:    
Accounts receivable, net (2,979,000) (923,000)
Accounts receivable, related party 201,000 (15,000)
Inventories, net (832,000) (638,000)
Prepaid expenses (375,000) 383,000
Accounts payable and accrued liabilities (841,000) (743,000)
Lease liabilities (213,000) (186,000)
Net cash and cash equivalents used in operating activities (3,959,000) (1,169,000)
Cash Flows From Investing Activities:    
Purchases of property and equipment (135,000) (83,000)
Net cash and cash equivalents used in investing activities (135,000) (83,000)
Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract]    
Proceeds from exercise of stock options 0 815,000
Repurchase of common stock (1,178,000) (1,417,000)
Treasury stock excise tax (12,000) (14,000)
Net cash and cash equivalents used in financing activities (1,190,000) (616,000)
Increase (decrease) in cash and cash equivalents (5,284,000) (1,868,000)
Cash and cash equivalents, beginning of the period 18,636,000 20,378,000
Cash and cash equivalents, end of the period 13,352,000 18,510,000
Supplemental Cash Flow Information [Abstract]    
Net non-cash changes to operating leases $ 0 $ 4,803,000