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Condensed Consolidated Statements of Operations - USD ($)
 3 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Income Statement [Abstract]    
Net revenue $ 25,825,000 $ 20,106,000
Cost of goods sold 20,010,000 16,401,000
Gross profit 5,815,000 3,705,000
Operating expenses:    
Product engineering and development 897,000 1,349,000
Selling, general and administrative 2,799,000 3,399,000
Total operating expenses 3,696,000 4,748,000
Operating income (loss) 2,119,000 (1,043,000)
Other income, net:    
Interest and dividend income, net of fees 493,000 277,000
Realized and unrealized gains on marketable securities, net 1,962,000 423,000
Total other income (expense), net 2,455,000 700,000
Income (loss) before income tax expense (benefit) 4,574,000 (343,000)
Income tax expense (benefit) 1,098,000 (69,000)
Net income (loss) $ 3,476,000 $ (274,000)
Basic income (loss) per common share $ 0.24 $ (0.02)
Diluted income (loss) per common share $ 0.24 $ (0.02)