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Consolidated Income Statements - USD ($)
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Income Statement [Abstract]    
Net revenue $ 113,166,000 $ 105,075,000
Cost of goods sold 81,839,000 76,038,000
Gross profit 31,327,000 29,037,000
Operating expenses:    
Product engineering and development 3,313,000 3,458,000
Selling, general and administrative 14,327,000 12,154,000
Total operating expenses 17,640,000 15,612,000
Operating income 13,687,000 13,425,000
Other income (expense), net:    
Interest and dividend income, net of fees 3,435,000 2,108,000
Realized and unrealized gains (losses) on marketable securities, net 3,621,000 3,243,000
Other (13,000) 0
Other income (expense),net 7,043,000 5,351,000
Income before income tax expense 20,730,000 18,776,000
Income tax expense 6,172,000 4,110,000
Net income $ 14,558,000 $ 14,666,000
Net income per common share - basic $ 0.99 $ 1
Net income per common share - diluted $ 0.99 $ 1