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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Cash Flows From Operating Activities:        
Net income $ 1,244,000 $ 1,644,000 $ 1,857,000 $ 2,220,000
Adjustments to reconcile net income to net cash and cash equivalents used in operating activities:        
Stock-based compensation     272,000 218,000
Depreciation and amortization 240,000 245,000 483,000 489,000
Equity in income of unconsolidated affiliate (137,000) (200,000) (278,000) (338,000)
Non-cash lease expense     462,000 434,000
Changes in operating assets and liabilities:        
Accounts receivable, net     (4,671,000) (2,760,000)
Accounts receivable, related party     (215,000) 458,000
Inventories, net     372,000 (654,000)
Prepaid expenses     438,000 (742,000)
Accounts payable and accrued liabilities     (156,000) (923,000)
Lease liabilities     (435,000) (444,000)
Net cash and cash equivalents used in operating activities     (1,871,000) (2,042,000)
Cash Flows From Investing Activities:        
Purchases of property and equipment     (273,000) (216,000)
Cash Flows From Financing Activities:        
Proceeds from exercise of stock options     0 815,000
Repurchase of common stock (830,000) (1,284,000) (2,008,000) (2,701,000)
Treasury stock excise tax     (20,000) (27,000)
Net cash and cash equivalents used in financing activities     (2,028,000) (1,913,000)
Decrease in cash and cash equivalents     (4,172,000) (4,171,000)
Cash and cash equivalents, beginning of the period     18,636,000 20,378,000
Cash and cash equivalents, end of the period $ 14,464,000 $ 16,207,000 14,464,000 16,207,000
Supplemental disclosure of non-cash transactions:        
Net non-cash changes to operating leases     $ 0 $ 4,803,000