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Condensed Consolidated Statements of Income - USD ($)
 3 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Income Statement [Abstract]    
Net revenue $ 18,030,000 $ 21,327,000
Costs and expenses:    
Production costs 13,710,000 16,410,000
Product engineering and development 766,000 723,000
Selling, general and administrative 2,382,000 2,190,000
Total operating expenses 16,858,000 19,323,000
Operating income 1,172,000 2,004,000
Other income (expense), net:    
Interest and dividend income, net of fees 632,000 534,000
Realized and unrealized gains (losses) on marketable securities, net 1,317,000 (2,147,000)
Other (10,000)  
Other income (expense),net 1,939,000 (1,613,000)
Income before income tax expense 3,111,000 391,000
Income tax expense 622,000 78,000
Net income $ 2,489,000 $ 313,000 [1]
Basic Income per Common Share:    
Net income per share $ 0.17 $ 0.02
Diluted Income per Common Share:    
Net income per share $ 0.17 $ 0.02
[1] The balances as of September 30, 2018 and December 31, 2018, and the amounts for the quarter ended December 31, 2018, have been adjusted to reflect the change in inventory accounting method, as described in Note 3 to the Condensed Consolidated Financial Statements.