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Note G - Stock-based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended		9 Months Ended
	Mar. 28, 2025	Mar. 29, 2024	Dec. 27, 2024	Dec. 29, 2023	Mar. 28, 2025	Mar. 29, 2024	Mar. 28, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)			1,636,550
Performance Stock Awards [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)	232,200	238,700			232,200	238,700
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)					116,100	119,300
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)					3 years	3 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)	350,000	329,900			350,000	329,900
Share-Based Payment Arrangement, Expense	$ 376	$ 326			$ 1,296	$ 704
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value (in dollars per share)	$ 10.85				$ 10.85
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 1,919				$ 1,919
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value					$ 0
Performance Stock Unit Awards [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)	20,900				20,900
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)					0	10,500
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)	10,500	10,500			10,500	10,500
Share-Based Payment Arrangement, Expense	$ 22	$ 11			$ 33	$ 29
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value (in dollars per share)	$ 12.15				$ 12.15
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 55				$ 55
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value						$ 0	$ 0
Restricted Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)					45.8	117.2
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)	251,300	246,600			251,300	246,600
Share-Based Payment Arrangement, Expense	$ 321	$ 330			$ 949	$ 953
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 877				877
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value					$ 454	$ 2,196
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period (in shares)			0	2,400
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)					3 years
Restricted Stock [Member] \| Minimum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)	1 year
Restricted Stock [Member] \| Maximum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)	3 years
Restricted Stock Units (RSUs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)					77,400	7,100
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)					3 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)	156,900	135,000			156,900	135,000
Share-Based Payment Arrangement, Expense	$ 137	$ 124			$ 327	$ 372
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value (in dollars per share)	$ 10.66				$ 10.66
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 852				$ 852
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value					$ 701	$ 25
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)					3 years
The 2021 Long-Term Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)			715,000
The 2020 Directors Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)			521,550
Amended and Restated 2021 Omnibus Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)			400,000