Note 11 - Stock Options - Transactions Involving the Directors Plans (Details) - Employee Plans [Member] - $ / shares	12 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Outstanding October 1, (in shares)	5,000	6,000	22,000
Outstanding October 1, (in dollars per share)	$ 3.54	$ 3.44	$ 5.30
Granted (in shares)
Granted (in dollars per share)
Canceled/expired (in shares)		(1,000)	(16,000)
Canceled/expired (in dollars per share)	$ 2.925	$ 2.925	$ 6
Outstanding September 30, (in shares)	5,000	5,000	6,000
Outstanding September 30, (in dollars per share)	$ 3.54	$ 3.54	$ 3.44
Exercisable September 30, (in shares)	5,000	5,000	6,000
Exercisable September 30, (in dollars per share)	$ 3.54	$ 3.54	$ 3.44

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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Weighted average price of options that were either forfeited or expired.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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