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Condensed Consolidated Statements of Operations - USD ($)
 3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Income Statement [Abstract]        
Net revenue $ 22,940,000 $ 18,848,000 $ 66,963,000 $ 66,845,000
Costs and expenses:        
Production costs 17,555,000 14,098,000 49,920,000 47,267,000
Product engineering and development 849,000 881,000 2,304,000 2,427,000
Selling, general and administrative 2,522,000 2,471,000 7,465,000 7,135,000
Total operating expenses 20,926,000 17,450,000 59,689,000 56,829,000
Operating income 2,014,000 1,398,000 7,274,000 10,016,000
Other income (expense), net:        
Interest and dividend income, net of fees 512,000 567,000 1,907,000 1,608,000
Net realized and unrealized gains (losses) on marketable securities 2,888,000 1,090,000 (1,465,000) 1,147,000
Other (10,000) 0 (20,000) 0
Other income (expense),net 3,390,000 1,657,000 422,000 2,755,000
Income before income tax expense 5,404,000 3,055,000 7,696,000 12,771,000
Income tax expense 1,082,000 611,000 1,540,000 2,554,000
Net income $ 4,322,000 $ 2,444,000 [1] $ 6,156,000 $ 10,217,000
Basic Income per Common Share:        
Net income per share $ 0.30 $ 0.17 $ 0.42 $ 0.70
Diluted Income per Common Share:        
Net income per share $ 0.29 $ 0.17 $ 0.42 $ 0.69
[1] The balances as of September 30, 2018, December 31, 2018, March 31, 2019 and June 30, 2019, and the amounts for the quarter and nine months ended June 30, 2019, have been adjusted to reflect the change in inventory accounting method, as described in Note 3 to the Condensed Consolidated Financial Statements.