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Note 5 - Fair Value Measurements - Fair Value by Major Security Type (Details) - USD ($) | Dec. 31, 2018 | Sep. 30, 2018
--- | --- | ---
Short-term marketable securities | $ 3,783,863 | $ 3,592,175
Long-term Securities | 899,759 | 1,200,541
Fair Value, Measurements, Nonrecurring [Member] |  |
Cost Basis | 5,232,032 | 5,212,054
Unrealized Gains (Losses) | (9,557) | (8,945)
Fair Value | 5,222,475 | 5,203,109
Cash Equivalents | 538,853 | 410,393
Short-term marketable securities | 3,783,863 | 3,592,175
Long-term Securities | 899,759 | 1,200,541
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Cost Basis | 538,922 | 410,393
Unrealized Gains (Losses) | (69) |
Fair Value | 538,853 | 410,393
Cash Equivalents | 538,853 | 410,393
Short-term marketable securities |  |
Long-term Securities |  |
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Cost Basis | 4,693,110 | 4,801,661
Unrealized Gains (Losses) | (9,488) | (8,945)
Fair Value | 4,683,622 | 4,792,716
Cash Equivalents |  |
Short-term marketable securities | 3,783,863 | 3,592,175
Long-term Securities | 899,759 | 1,200,541
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Certificates of Deposit [Member] |  |
Cost Basis | 499,000 | 499,000
Unrealized Gains (Losses) |  |
Fair Value | 499,000 | 499,000
Cash Equivalents |  |
Short-term marketable securities |  |
Long-term 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 | 286,070 |
Unrealized Gains (Losses) | (277) |
Fair Value | 285,793 |
Cash Equivalents |  |
Short-term marketable securities | 285,793 |
Long-term Securities |  |
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |
Cost Basis | 3,908,040 | 4,302,661
Unrealized Gains (Losses) | (9,211) | (8,945)
Fair Value | 3,898,829 | 4,293,716
Cash Equivalents |  |
Short-term marketable securities | 3,498,070 | 3,592,175
Long-term Securities | $ 400,759 | $ 701,541

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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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