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Condensed Consolidated Statements of Income (Unaudited) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Income Statement [Abstract]        
Net revenue $ 22,526,000 $ 22,078,000 $ 38,309,000 $ 35,336,000
Costs and expenses:        
Production costs 15,869,000 16,637,000 27,502,000 26,613,000
Product engineering and development 470,000 379,000 886,000 761,000
Selling, general and administrative 2,127,000 2,190,000 4,317,000 3,975,000
Total costs and expenses 18,466,000 19,206,000 32,705,000 31,349,000
Operating income 4,060,000 2,872,000 5,604,000 3,987,000
Other income (expense), net:        
Interest and dividend income, net of fees 162,000 204,000 203,000 589,000
Net realized and unrealized gains (losses) on marketable securities 656,000 (490,000) 1,063,000 103,000
Other   1,000   2,000
Other income (expense), net 818,000 (285,000) 1,266,000 694,000
Income before income tax expense 4,878,000 2,587,000 6,870,000 4,681,000
Income tax expense 1,463,000 957,000 2,061,000 1,476,000
Net income $ 3,415,000 $ 1,630,000 $ 4,809,000 $ 3,205,000
Basic Income per Common Share:        
Net income per share [1] $ 0.24 $ 0.11 $ 0.33 $ 0.22
Diluted Income per Common Share:        
Net income per share [1] $ 0.23 $ 0.11 $ 0.33 $ 0.22
[1] Prior year adjusted for three-for-two stock split