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Note 5 - Fair Value Measurements - Fair Value by Major Security Type (Details) - USD ($) | Dec. 31, 2019 | Sep. 30, 2019
--- | --- | ---
Short-term marketable securities | $ 4,181,909 | $ 3,695,364
Long-term Securities | 945,833 | 1,384,819
Fair Value, Nonrecurring [Member] |  |
Cost Basis | 5,374,274 | 5,344,359
Unrealized Gains (Losses) | 7,876 | 11,362
Fair Value | 5,382,150 | 5,355,721
Cash Equivalents | 254,408 | 275,538
Short-term marketable securities | 4,181,909 | 3,695,364
Long-term Securities | 945,833 | 1,384,819
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Cost Basis | 254,408 | 275,538
Unrealized Gains (Losses) |  |
Fair Value | 254,408 | 275,538
Cash Equivalents | 254,408 | 275,538
Short-term marketable securities |  |
Long-term Securities |  |
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Cost Basis | 5,119,866 | 5,068,821
Unrealized Gains (Losses) | 7,876 | 11,362
Fair Value | 5,127,742 | 5,080,183
Cash Equivalents |  |
Short-term marketable securities | 4,181,909 | 3,695,364
Long-term Securities | 945,833 | 1,384,819
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Certificates of Deposit [Member] |  |
Cost Basis | 1,444,833 | 971,592
Unrealized Gains (Losses) |  |
Fair Value | 1,444,833 | 971,592
Cash Equivalents |  |
Short-term marketable securities | 499,000 | 499,000
Long-term Securities | 945,833 | 472,592
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Cost Basis | 270,221 | 240,463
Unrealized Gains (Losses) | 453 | 205
Fair Value | 270,674 | 240,668
Cash Equivalents |  |
Short-term marketable securities | 270,674 | 80,336
Long-term Securities |  | 160,332
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |
Cost Basis | 3,404,812 | 3,856,766
Unrealized Gains (Losses) | 7,423 | 11,157
Fair Value | 3,412,235 | 3,867,923
Cash Equivalents |  |
Short-term marketable securities | 3,412,235 | 3,116,028
Long-term Securities |  | $ 751,895

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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=117815213&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=118939692&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 + 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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