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Note 6 - Fair Value Measurements - Fair Value by Major Security Type (Details) - USD ($) | Mar. 31, 2018 | Sep. 30, 2017
--- | --- | ---
Short-term marketable securities | $ 4,063,109 | $ 4,359,542
Long-term marketable securities | 991,178 | 711,124
Fair Value, Measurements, Nonrecurring [Member] |  |
Cost Basis | 5,170,963 | 5,127,192
Unrealized Gains (Losses) | (18,138) | (1,269)
Fair Value | 5,152,826 | 5,125,923
Cash Equivalents | 98,539 | 55,257
Short-term marketable securities | 4,063,109 | 4,359,542
Long-term marketable securities | 991,178 | 711,124
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Cost Basis | 98,539 | 55,257
Unrealized Gains (Losses) |  |
Fair Value | 98,539 | 55,257
Cash Equivalents | 98,539 | 55,257
Short-term marketable securities |  |
Long-term marketable securities |  |
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Cost Basis | 5,072,424 | 5,071,935
Unrealized Gains (Losses) | (18,138) | (1,269)
Fair Value | 5,054,287 | 5,070,666
Cash Equivalents |  |
Short-term marketable securities | 4,063,109 | 4,359,542
Long-term marketable securities | 991,178 | 711,124
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Certificates of Deposit [Member] |  |
Cost Basis | 936,952 | 2,436,647
Unrealized Gains (Losses) |  |
Fair Value | 936,952 | 2,436,647
Cash Equivalents |  |
Short-term marketable securities | 437,952 | 1,937,647
Long-term marketable securities | 499,000 | 499,000
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Cost Basis | 85,626 | 25,315
Unrealized Gains (Losses) | (168) | (12)
Fair Value | 85,459 | 25,303
Cash Equivalents |  |
Short-term marketable securities | 85,459 | 25,303
Long-term marketable securities |  |
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |
Cost Basis | 4,049,846 | 2,609,973
Unrealized Gains (Losses) | (17,970) | (1,257)
Fair Value | 4,031,876 | 2,608,716
Cash Equivalents |  |
Short-term marketable securities | 3,539,698 | 2,396,592
Long-term marketable securities | $ 492,178 | $ 212,124

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- 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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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. + Details
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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. + References No definition available. + Details
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- Definition Amount of investment in marketable security, classified as current. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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