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Consolidated Income Statements - USD ($)
 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Income Statement [Abstract]    
Net revenue $ 77,420,000 $ 81,329,000
Cost of goods sold 58,467,000 58,917,000
Gross profit 18,953,000 22,412,000
Operating expenses:    
Product engineering and development 3,061,000 3,295,000
Selling, general and administrative 10,356,000 9,647,000
Total operating expenses 13,417,000 12,942,000
Operating income 5,536,000 9,470,000
Other income (expense), net:    
Interest and dividend income, net of fees 2,321,000 2,307,000
Realized and unrealized gains (losses) on marketable securities, net (1,160,000) 1,047,000
Other (16,000)  
Other income (expense),net 1,145,000 3,354,000
Income before income tax expense 6,681,000 12,824,000
Income tax expense 1,150,000 2,628,000
Net income $ 5,531,000 $ 10,196,000
Basic earnings per common share $ 0.38 $ 0.70
Diluted earnings per common share $ 0.38 $ 0.69