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Condensed Consolidated Statements of Operations - USD ($)
 3 Months Ended 9 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Income Statement [Abstract]        
Net revenue $ 29,647,000 $ 24,919,000 $ 80,407,000 $ 65,235,000
Cost of goods sold 23,968,000 19,314,000 64,831,000 50,504,000
Gross profit 5,679,000 5,605,000 15,576,000 14,731,000
Operating expenses:        
Product engineering and development 951,000 1,176,000 3,219,000 3,089,000
Selling, general and administrative 2,577,000 3,202,000 9,340,000 10,235,000
Total operating expenses 3,528,000 4,378,000 12,559,000 13,324,000
Operating income 2,151,000 1,227,000 3,017,000 1,407,000
Other income (expense), net:        
Interest and dividend income, net of fees 304,000 306,000 877,000 1,437,000
Net realized and unrealized gains (losses) on marketable securities, net (3,693,000) 1,386,000 (4,758,000) 4,873,000
Other (1,000)   (139,000)  
Total other income (expense), net (3,390,000) 1,692,000 (4,020,000) 6,310,000
Income (loss) before income tax expense (benefit) (1,239,000) 2,919,000 (1,003,000) 7,717,000
Income tax expense (benefit) (224,000) 584,000 (153,000) 1,543,000
Net income (loss) $ (1,015,000) $ 2,335,000 $ (850,000) $ 6,174,000
Basic Income (Loss) per Common Share:        
Net income (loss) per share $ (0.07) $ 0.16 $ (0.06) $ 0.42
Diluted Income (Loss) per Common Share:        
Net income (loss) per share $ (0.07) $ 0.16 $ (0.06) $ 0.42