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Note 6 - Fair Value Measurements - Fair Value by Major Security Type (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Sep. 30, 2020
--- | --- | ---
Short-term marketable securities | $ 5,686 | $ 4,265
Long-term Securities | 1,875 | 3,805
Fair Value, Nonrecurring [Member] |  |
Cost Basis | 8,493 | 8,428
Unrealized Gains (Losses) | 0 | 7
Fair Value | 8,493 | 8,435
Cash Equivalents | 932 | 365
Short-term marketable securities | 5,686 | 4,265
Long-term Securities | 1,875 | 3,805
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Cost Basis | 932 | 365
Unrealized Gains (Losses) | 0 | 0
Fair Value | 932 | 365
Cash Equivalents | 932 | 365
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Cost Basis | 7,561 | 8,063
Unrealized Gains (Losses) | 0 | 7
Fair Value | 7,561 | 8,070
Cash Equivalents | 0 | 0
Short-term marketable securities | 5,686 | 4,265
Long-term Securities | 1,875 | 3,805
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Certificates of Deposit [Member] |  |
Cost Basis | 1,494 | 1,195
Unrealized Gains (Losses) | 0 | 0
Fair Value | 1,494 | 1,195
Cash Equivalents | 0 | 0
Short-term marketable securities | 694 |
Long-term Securities | 800 | 1,195
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Cost Basis | 5,139 | 3,777
Unrealized Gains (Losses) | (1) | 4
Fair Value | 5,138 | 3,781
Cash Equivalents | 0 | 0
Short-term marketable securities | 4,205 | 2,431
Long-term Securities | 933 | 1,350
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |
Cost Basis | 928 | 3,091
Unrealized Gains (Losses) | 1 | 3
Fair Value | 929 | 3,094
Cash Equivalents | 0 | 0
Short-term marketable securities | 787 | 1,834
Long-term Securities | $ 142 | $ 1,260

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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=123874694&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=123581744&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=124258926&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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- Definition Amount, before tax, of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References No definition available. + Details
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