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Note 5 - Share Repurchase Program (Details Textual) $ in Millions		3 Months Ended		9 Months Ended
	Aug. 13, 2020	Jun. 30, 2022 USD ($) shares	Mar. 31, 2022 USD ($) shares	Sep. 30, 2025 USD ($) shares	May 03, 2022 USD ($) shares	Aug. 31, 2020 shares	Aug. 31, 2019 USD ($) shares
Share Repurchase Program, Authorized, Amount | $					$ 50.0		$ 34.0
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) | shares					3,100,000	2,700,000	1,800,000
Stock Repurchased and Retired During Period, Shares (in shares) | shares		963,000	1,300,000	0
Stock Repurchased and Retired During Period, Value | $		$ 16.8	$ 25.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $				$ 33.2
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased (in shares) | shares				2,200,000
Stock Split To [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio	3
Stock Split from [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio	2

X

- Definition

Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481520/505-30-50-4

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Number of shares authorized to be purchased under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

+ References

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Amount remaining authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

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