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Condensed Consolidated Statements of Operations - USD ($)
 3 Months Ended 9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Income Statement [Abstract]        
Net revenue $ 27,877,000 $ 29,647,000 $ 84,204,000 $ 80,407,000
Cost of goods sold 20,365,000 23,968,000 61,780,000 64,831,000
Gross profit 7,512,000 5,679,000 22,424,000 15,576,000
Operating expenses:        
Product engineering and development 845,000 951,000 2,616,000 3,219,000
Selling, general and administrative 3,214,000 2,577,000 9,075,000 9,340,000
Total operating expenses 4,059,000 3,528,000 11,691,000 12,559,000
Operating income 3,453,000 2,151,000 10,733,000 3,017,000
Other income (expense), net:        
Interest and dividend income, net of fees 673,000 304,000 1,731,000 877,000
Net realized and unrealized gains (losses) on marketable securities, net 46,000 (3,693,000) 2,700,000 (4,758,000)
Other 0 (1,000)   (139,000)
Total other income (expense), net 719,000 (3,390,000) 4,431,000 (4,020,000)
Income (loss) before income tax expense (benefit) 4,172,000 (1,239,000) 15,164,000 (1,003,000)
Income tax expense (benefit) 960,000 (224,000) 3,603,000 (153,000)
Net income (loss) $ 3,212,000 $ (1,015,000) $ 11,561,000 $ (850,000)
Basic income (loss) per common share $ 0.22 $ (0.07) $ 0.79 $ (0.06)
Diluted income (loss) per common share $ 0.22 $ (0.07) $ 0.79 $ (0.06)