Note C - Shareholders' Equity - Options Currently Outstanding (Details) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Sep. 30, 2017 |
Sep. 30, 2016 |
Sep. 30, 2015 |
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| Number outstanding (in shares) | 38,950 | 54,800 | 297,384 |
| Weighted average remaining contractual life (Year) | 2 years 266 days | 2 years 302 days | |
| Weighted average exercise price (in dollars per share) | $ 2.79 | $ 3.13 | $ 5.29 |
| Aggregate intrinsic value | $ 421,237 | $ 858,771 | |
| X | ||||||||||
- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Number of options outstanding, including both vested and non-vested options. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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