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Note 5 - Fair Value Measurements - Fair Value by Major Security Type (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Short-term marketable securities | $ 4,265 | $ 3,695
Long-term Securities | 3,805 | 1,385
Fair Value, Nonrecurring [Member] |  |
Cost Basis | 8,428 | 5,345
Unrealized Gains (Losses) | 7 | 11
Fair Value | 8,435 | 5,356
Cash Equivalents | 365 | 276
Short-term marketable securities | 4,265 | 3,695
Long-term Securities | 3,805 | 1,385
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Cost Basis | 365 | 276
Unrealized Gains (Losses) |  |
Fair Value | 365 | 276
Cash Equivalents | 365 | 276
Short-term marketable securities |  |
Long-term Securities |  |
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Cost Basis | 8,063 | 5,069
Unrealized Gains (Losses) | 7 | 11
Fair Value | 8,070 | 5,080
Cash Equivalents |  |
Short-term marketable securities | 4,265 | 3,695
Long-term Securities | 3,805 | 1,385
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Certificates of Deposit [Member] |  |
Cost Basis | 1,195 | 972
Unrealized Gains (Losses) |  |
Fair Value | 1,195 | 972
Cash Equivalents |  |
Short-term marketable securities |  | 499
Long-term Securities | 1,195 | 473
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Cost Basis | 3,777 | 240
Unrealized Gains (Losses) | 4 |
Fair Value | 3,781 | 240
Cash Equivalents |  |
Short-term marketable securities | 2,432 | 80
Long-term Securities | 1,350 | 160
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |
Cost Basis | 3,091 | 3,857
Unrealized Gains (Losses) | 3 | 11
Fair Value | 3,094 | 3,868
Cash Equivalents |  |
Short-term marketable securities | 1,833 | 3,116
Long-term Securities | $ 1,260 | $ 752

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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=121645371&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=121558606&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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