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Consolidated Statements of Shareholders' Equity - USD ($) | Total | Capital in Excess of Par Value [Member] | [1] | Retained Earnings [Member] | Common Stock [Member] | Class B Stock [Member]
--- | --- | --- | --- | --- | --- | ---
Beginning balance at Sep. 30, 2014 |  | $ 114,175,000 | $ 10,090,000 | $ 102,657,000 | $ 1,202,000 | [1] | $ 226,000 | [1]
Beginning balance, shares at Sep. 30, 2014 | [1] |  |  |  | 12,015,079 |  | 2,263,857 |
Net income (loss) |  | (1,819,000) |  | (1,819,000) |  |  |  |
Stock-based compensation |  | 253,000 | 253,000 |  |  |  |  |
Stock options exercised |  | 136,000 | 133,000 |  | $ 3,000 | [1] |  |
Stock options exercised, shares | [1] |  |  |  | 28,125 |  |  |
Ending balance at Sep. 30, 2015 |  | 112,745,000 | 10,476,000 | 100,838,000 | $ 1,205,000 | [1] | $ 226,000 | [1]
Ending balance, shares at Sep. 30, 2015 | [1] |  |  |  | 12,043,204 |  | 2,263,857 |
Net income (loss) |  | 7,043,000 |  | 7,043,000 |  |  |  |
Stock-based compensation |  | 37,000 | 37,000 |  |  |  |  |
Stock options exercised |  | 380,000 | 374,000 |  | $ 6,000 | [1] |  |
Stock options exercised, shares | [1] |  |  |  | 67,875 |  |  |
Ending balance at Sep. 30, 2016 |  | 120,205,000 | 10,887,000 | 107,881,000 | $ 1,211,000 | [1] | $ 226,000 | [1]
Ending balance, shares at Sep. 30, 2016 | [1] |  |  |  | 12,111,079 |  | 2,263,857 |
Net income (loss) |  | 8,418,000 |  | 8,418,000 |  |  |  |
Stock-based compensation |  | 71,000 | 71,000 |  |  |  |  |
Stock options exercised |  | 224,000 | 220,000 |  | $ 4,000 | [1] |  |
Stock options exercised, shares | [1] |  |  |  | 43,750 |  |  |
Ending balance at Sep. 30, 2017 |  | $ 128,918,000 | $ 11,178,000 | $ 116,299,000 | $ 1,215,000 | [1] | $ 226,000 | [1]
Ending balance, shares at Sep. 30, 2017 | [1] |  |  |  | 12,154,829 |  | 2,263,857 |
[1] | 2016 and 2015 adjusted for three-for-two stock split

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