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Condensed Consolidated Statements of Operations - USD ($)
 3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Income Statement [Abstract]        
Net revenue $ 25,993,000 $ 26,670,000 $ 44,023,000 $ 47,997,000
Costs and expenses:        
Production costs 18,655,000 16,759,000 32,365,000 33,169,000
Product engineering and development 689,000 823,000 1,455,000 1,546,000
Selling, general and administrative 2,561,000 2,474,000 4,943,000 4,664,000
Total operating expenses 21,905,000 20,056,000 38,763,000 39,379,000
Operating income 4,088,000 6,614,000 5,260,000 8,618,000
Other income (expense), net:        
Interest and dividend income, net of fees 763,000 507,000 1,395,000 1,041,000
Net realized and unrealized gains (losses) on marketable securities (5,670,000) 2,204,000 (4,353,000) 57,000
Other 0 0 (10,000) 0
Other income (expense),net (4,907,000) 2,711,000 (2,968,000) 1,098,000
Income (loss) before income tax expense (benefit) (819,000) 9,325,000 2,292,000 9,716,000
Income tax expense (benefit) (164,000) 1,865,000 458,000 1,943,000
Net income (loss) $ (655,000) $ 7,460,000 [1] $ 1,834,000 $ 7,773,000
Basic Income (Loss) per Common Share:        
Net income (loss) per share $ (0.04) $ 0.51 $ 0.13 $ 0.53
Diluted Income (Loss) per Common Share:        
Net income (loss) per share $ (0.04) $ 0.51 $ 0.12 $ 0.53
[1] The balances as of September 30, 2018, December 31, 2018 and March 31, 2019, and the amounts for the quarter and six months ended March 31, 2019, have been adjusted to reflect the change in inventory accounting method, as described in Note 3 to the Condensed Consolidated Financial Statements.