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Condensed Consolidated Balance Sheets - USD ($)
Sep. 30, 2024
Dec. 31, 2023
Current assets:    
Cash and cash equivalents $ 4,708,000 $ 6,205,000
Accounts receivable, less allowances of $7,000 623,000 92,000
Short-term investments (Note 2) 4,912,000 3,630,000
Inventories, less reserves for obsolescence of $5,130,000, and $5,069,000, respectively (Note 3) 2,998,000 2,597,000
Prepaid expenses and other current assets 137,000 283,000
Total current assets 13,378,000 12,807,000
Property and equipment, net 3,068,000 2,970,000
Deferred taxes 2,045,000 2,043,000
Other assets (Note 5) 186,000 186,000
Total assets 18,677,000 18,006,000
Current liabilities:    
Accounts payable 725,000 194,000
Accrued liabilities 792,000 969,000
Total current and total liabilities 1,517,000 1,163,000
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 11,483,000 11,474,000
Accumulated other comprehensive income (53,000) (61,000)
Retained earnings 5,724,000 5,424,000
Total equity 17,160,000 16,843,000
Total liabilities and equity 18,677,000 18,006,000
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