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Condensed Consolidated Balance Sheets - USD ($)
Mar. 31, 2025
Dec. 31, 2024
Current assets:    
Cash and cash equivalents $ 4,037,000 $ 4,208,000
Accounts receivable, less allowances of $7,000 219,000 421,000
Short-term investments (Note 2) 4,778,000 5,179,000
Inventories, less reserves for obsolescence of $5,155,000, and $5,152,000, respectively (Note 3) 2,867,000 2,949,000
Prepaid expenses and other current assets 160,000 122,000
Total current assets 12,061,000 12,879,000
Property and equipment, net 2,997,000 3,029,000
Deferred taxes 1,543,000 1,542,000
Other assets (Note 4) 128,000 186,000
Total assets 16,729,000 17,636,000
Current liabilities:    
Accounts payable 60,000 251,000
Accrued liabilities 706,000 822,000
Total current liabilities 766,000 1,073,000
Commitments and contingencies (Note 6)
Shareholders’ equity:    
Preferred stock, $0.001 par value. Authorized 5,000,000 shares; None issued or outstanding 0 0
Additional paid-in capital 11,485,000 11,484,000
Accumulated other comprehensive loss (63,000) (49,000)
Retained earnings 4,535,000 5,122,000
Total equity 15,963,000 16,563,000
Total liabilities and equity 16,729,000 17,636,000
Common Class A [Member]    
Shareholders’ equity:    
Common stock, value 5,000 5,000
Common Class B [Member]    
Shareholders’ equity:    
Common stock, value $ 1,000 $ 1,000