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Note 8 - Fair Value of Financial Instruments (Tables)

9 Months Ended

Jun. 30, 2025

Notes Tables

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

		Level 1				Level 2				Level 3				Total
Money market funds (cash equivalent)		$	3,846			$	-			$	-			$	3,846
Marketable securities			443,011				-				-				443,011
Total		$	446,857			$	-			$	-			$	446,857

		Level 1				Level 2				Level 3				Total
Money market funds (cash equivalent)		$	3,945			$	-			$	-			$	3,945
Marketable securities			358,691				-				-				358,691
Total		$	362,636			$	-			$	-			$	362,636

Schedule of Available-for-Sale Securities Reconciliation [Table Text Block]

		June 30, 2025												September 30, 2024
		Aggregate fair value				Amortized/ Adjusted cost basis				Pretax unrealized gains				Aggregate fair value				Amortized/ Adjusted cost basis				Pretax unrealized gains
Marketable securities
Common stocks		$	443,011			$	139,094			$	303,917			$	358,691			$	139,094			$	219,597

X

- Definition

Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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X

- Definition

Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value.

+ References

No definition available.

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X

- References

No definition available.

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