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Note 5 - Fair Value Measurements - Fair Value by Major Security Type (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Sep. 30, 2021
Short-term marketable securities	$ 3,938	$ 5,686
Long-term Securities	3,381	1,875
Fair Value, Nonrecurring [Member]
Cost Basis	8,510	8,493
Unrealized Gains (Losses)	(10)	0
Fair Value	8,500	8,493
Cash Equivalents	1,181	932
Short-term marketable securities	3,938	5,686
Long-term Securities	3,381	1,875
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]
Cost Basis	1,181	932
Unrealized Gains (Losses)	0	0
Fair Value	1,181	932
Cash Equivalents	1,181	932
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]
Cost Basis	7,329	7,561
Unrealized Gains (Losses)	(10)	0
Fair Value	7,319	7,561
Cash Equivalents	0	0
Short-term marketable securities	3,938	5,686
Long-term Securities	3,381	1,875
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Certificates of Deposit [Member]
Cost Basis	1,493	1,494
Unrealized Gains (Losses)	0	0
Fair Value	1,493	1,494
Cash Equivalents	0	0
Short-term marketable securities	693
Long-term Securities	800	800
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member]
Cost Basis	4,907	5,139
Unrealized Gains (Losses)	(5)	(1)
Fair Value	4,902	5,138
Cash Equivalents	0	0
Short-term marketable securities	3,106	4,205
Long-term Securities	1,796	933
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member]
Cost Basis	929	928
Unrealized Gains (Losses)	(5)	1
Fair Value	924	929
Cash Equivalents	0	0
Short-term marketable securities	139	787
Long-term Securities	$ 785	$ 142

X

- 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
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-Paragraph 2
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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
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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.

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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

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- Definition

Amount of investment in marketable security, classified as current.

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-Topic 210
-SubTopic 10
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Amount of investment in marketable security, classified as noncurrent.

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