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Note 4 - Fair Value Measurements - Fair Value by Major Security Type (Details) - USD ($)	Jun. 30, 2017	Sep. 30, 2016
Short-term marketable securities	$ 3,614,298	$ 2,936,124
Long-term marketable securities	1,408,893	2,187,536
Fair Value, Measurements, Nonrecurring [Member]
Cash Equivalents	90,054	95,538
Short-term marketable securities	3,614,298	2,936,124
Long-term marketable securities	1,408,893	2,187,536
Cost Basis	5,116,665	5,220,747
Unrealized Gains (Losses)	(3,420)	(1,549)
Fair Value	5,113,245	5,219,198
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]
Cash Equivalents	90,054	95,538
Short-term marketable securities
Long-term marketable securities
Cost Basis	90,054	95,538
Unrealized Gains (Losses)
Fair Value	90,054	95,538
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]
Cash Equivalents
Short-term marketable securities	3,614,298	2,936,124
Long-term marketable securities	1,408,893	2,187,536
Cost Basis	5,026,611	5,125,209
Unrealized Gains (Losses)	(3,420)	(1,549)
Fair Value	5,023,191	5,123,660
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member]
Short-term marketable securities	1,540,351	1,496,354
Long-term marketable securities	1,219,890	250,501
Cost Basis	2,763,669	1,748,404
Unrealized Gains (Losses)	(3,428)	(1,549)
Fair Value	2,760,241	1,746,855
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Certificates of Deposit [Member]
Short-term marketable securities	2,048,490	1,299,133
Long-term marketable securities	189,003	1,937,035
Cost Basis	2,237,493	3,236,168
Unrealized Gains (Losses)
Fair Value	2,237,493	3,236,168
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member]
Cash Equivalents
Short-term marketable securities	25,457	140,637
Cost Basis	25,449	140,637
Unrealized Gains (Losses)	8
Fair Value	$ 25,457	$ 140,637

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Amount before tax of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

No definition available.

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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of investments in debt and equity securities, including, but not limited to, held-to-maturity, trading and available-for-sale expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Total debt and equity financial instruments including: (1) securities held-to-maturity and (2) securities available-for-sale that will be held for the long-term.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562

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