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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Cash Flows From Operating Activities:        
Net income $ 976,000 $ 862,000 $ 2,833,000 $ 3,082,000
Adjustments to reconcile net income to net cash and cash equivalents used in operating activities:        
Stock-based compensation     408,000 327,000
Depreciation and amortization 203,000 245,000 686,000 734,000
Equity in income of unconsolidated affiliate (27,000) (97,000) (305,000) (435,000)
Gain on sale of asset 0 (30,000) 0 (30,000)
Non-cash lease expense     698,000 674,000
Changes in operating assets and liabilities:        
Accounts receivable, net     (1,807,000) (123,000)
Accounts receivable, related party     (428,000) 397,000
Inventory, net     (746,000) (946,000)
Prepaid expenses     894,000 342,000
Accounts payable and accrued liabilities     489,000 (70,000)
Lease liabilities     (670,000) (667,000)
Net cash and cash equivalents used in operating activities     2,052,000 3,285,000
Cash Flows From Investing Activities:        
Purchases of property and equipment     (372,000) (2,363,000)
Proceeds from sale of asset     0 30,000
Net cash and cash equivalents used in investing activities     (372,000) (2,333,000)
Cash Flows From Financing Activities:        
Proceeds from exercise of stock options     0 832,000
Repurchase of common stock (624,000) (1,030,000) (2,632,000) (3,731,000)
Treasury stock excise tax     (26,000) (37,000)
Net cash and cash equivalents used in financing activities     (2,658,000) (2,936,000)
Decrease in cash and cash equivalents     (978,000) (1,984,000)
Cash and cash equivalents, beginning of the period     18,636,000 20,378,000
Cash and cash equivalents, end of the period $ 17,658,000 $ 18,394,000 17,658,000 18,394,000
Supplemental disclosure of non-cash transactions:        
Net non-cash changes to operating leases     $ 0 $ 4,803,000