Note 9 - Stock Compensation Plans - Option Activity and Transactions (Details) - $ / shares	12 Months Ended
Dec. 31, 2022	Dec. 25, 2021	Dec. 26, 2020	Dec. 12, 2022
Options outstanding (in shares)	0	10,000	20,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross	0	0	0
Options outstanding, price (in dollars per share)	$ 0	$ 14.39	$ 14.39
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Ending Balance	0	0	10,000	0
Options issued during year, price (in dollars per share)	$ 0	$ 0	$ 0
Options canceled or expired (in shares)	0	0	0
Options canceled or expired, price (in dollars per share)	$ 0	$ 0	$ 0
Options exercised (in shares)	0	(10,000)	(10,000)
Options exercised, price (in dollars per share)	$ 0	$ 14.39	$ 14.39
Options outstanding (in shares)	0	0	10,000
Options outstanding, price (in dollars per share)	$ 0	$ 0	$ 14.39
Exercisable at end of year (in shares)	0	0	10,000
Weighted-average fair value of options granted during the year (in dollars per share)	$ 0	$ 0	$ 0
Incentive Stock Options [Member]
Options outstanding (in shares)	0	10,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross	0	0	0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Ending Balance	0	0	10,000
Options outstanding (in shares)	0	0	10,000
Director Stock Options [Member]
Options outstanding (in shares)	0	0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross	0	0	0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Ending Balance	0	0	0
Options outstanding (in shares)	0	0	0

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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