Note P - Impact of Accounting Method Change - Adjustment to Financial Statements (Details) (Parentheticals) - USD ($) $ / shares in Thousands, $ in Thousands	3 Months Ended
Sep. 30, 2023	Sep. 29, 2023	Sep. 30, 2022	Jun. 30, 2023
Benefit plan adjustments, income taxes	$ 5	$ 5	$ 9
Preferred Shares, Authorized (in shares)		200,000		200,000
Preferred Shares, Issued (in shares)		0		0
Preferred Shares, No Par Value (in dollars per share)		$ 0		$ 0
Common shares, authorized (in shares)		30,000,000		30,000,000
Common shares, shares issued (in shares)		14,632,802		14,632,802
Common shares, no par value (in dollars per share)		$ 0		$ 0
Treasury Stock, Common, Shares (in shares)		674,354		814,734

Face amount per share of no-par value common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ References

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- Definition

Amount of tax (expense) benefit of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 12
-SubTopic 10
-Topic 220
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482790/220-10-45-12

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- Definition

Face amount per share of no-par value preferred stock nonredeemable or redeemable solely at the option of the issuer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
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-Topic 505
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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
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- Definition

Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
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Number of previously issued common shares repurchased by the issuing entity and held in treasury.

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-Topic 505
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