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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
 3 Months Ended
Sep. 30, 2023
Sep. 30, 2022
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS    
Net sales $ 6,635,000 $ 5,852,000
Cost of goods sold 4,816,000 4,293,000
Gross profit 1,819,000 1,559,000
Operating expenses:    
Research and development 67,000 66,000
Selling and marketing 542,000 610,000
General and administrative 826,000 835,000
Impairment of long-term assets 0  
Total operating expenses 1,435,000 1,511,000
Operating profit 384,000 48,000
Other income (expense)    
Unrealized loss on marketable securities   (140,000)
Realized loss on marketable securities   (23,000)
Interest and other income, net 55,000 20,000
Total other income (expense) 55,000 (143,000)
Net profit/(loss) $ 439,000 $ (95,000)
Weighted average shares outstanding: basic 10,685,778 10,928,724
Weighted average shares outstanding: diluted 10,685,778 10,928,724
Net profit/(loss) per common share basic $ 0.04 $ (0.01)
Net profit/(loss) per common share diluted $ 0.04 $ (0.01)