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Note L - Stockholders' Equity, Stock Plans and Other Employee Benefit Plans (Details Textual)							10 Months Ended	12 Months Ended			61 Months Ended
	Jun. 11, 2021 $ / shares	Jun. 12, 2020 $ / shares	Jun. 14, 2019 $ / shares	Jun. 01, 2016 USD ($)	Jun. 04, 2013 USD ($) $ / shares shares	Nov. 01, 2012 USD ($) shares	Mar. 28, 2021 USD ($) $ / shares shares	Mar. 28, 2021 USD ($) $ / shares shares	Mar. 29, 2020 USD ($) $ / shares shares	Dec. 31, 2017 USD ($)	Mar. 28, 2021 USD ($) shares	Dec. 31, 2020 USD ($)	Sep. 18, 2019 shares	Mar. 11, 2016 shares	Sep. 13, 2012 shares
Common Stock, Dividends, Per Share, Declared (in dollars per share) \| $ / shares		$ 0.35	$ 0.35				$ 0.35	$ 1.40	$ 1.40
Common Stock, Dividends, Per Share, Declared (in dollars per share) \| $ / shares									$ 0.35
Payments of Ordinary Dividends, Common Stock							$ 5,761,000		$ 5,912,000
Share-based Payment Arrangement, Expense, Tax Benefit								$ 32,000	$ 29,000
Share Based Compensation Total Unamortized Compensation Expense							$ 54,000	$ 54,000			$ 54,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)								5 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares) \| shares								(0)	32,234
Proceeds from Stock Options Exercised								$ 0	$ 1,078,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value									1,134,000
Treasury Stock, Value, Acquired, Cost Method								1,501,000	$ 4,966,000
Number of Times of Salary and Bonus Lump Sum Cash Payment									2.99
Defined Contribution Plan, Employer Discretionary Contribution Amount								$ 36,000	$ 44,000
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent									20.00%
Defined Contribution Plan, Employer Matching Contribution Rate Per Dollar (in dollars per share) \| $ / shares								$ 25
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay								3.00%
Multiemployer Plans, Withdrawal Obligation												$ 384,000
Multiemployer Plan, Employer Contribution, Cost, Total								$ 5,000	$ 6,000
Executive Chairman of the Board [Member]
Term of Consulting Period Pursuant to the Lorber Employment [Agreement] (Year)										3 years
Base Salary [Member] \| Executive Chairman of the Board [Member]
Contractual Obligation, Total						$ 600,000
Base Salary [Member] \| Chief Executive Officer [Member]
Defined Contribution Plan, Employer Discretionary Contribution Amount				$ 500,000
Consulting Fee [Member] \| Executive Chairman of the Board [Member]
Contractual Obligation, Total						$ 200,000
Repurchase Program [Member]
Treasury Stock, Shares, Acquired (in shares) \| shares								26,676
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) \| $ / shares								$ 56.26
Treasury Stock, Value, Acquired, Cost Method								$ 1,501
Sixth Stock Repurchase Plan [Member]
Treasury Stock, Shares, Acquired (in shares) \| shares											1,066,450
Treasury Stock, Value, Acquired, Cost Method								$ 37,108
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) \| shares														1,200,000
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased (in shares) \| shares							133,550	133,550			133,550
Special Cash Dividend [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value								$ 17,000	$ 23,000
Share-based Payment Arrangement, Option [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)								5 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)								3 years
Share-based Payment Arrangement, Option [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)								10 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)								5 years
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) \| shares								0
Restricted Stock [Member] \| Executive Chairman of the Board [Member]
Contractual Obligation, Total										$ 1,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) \| shares						50,000
Restricted Stock [Member] \| Chief Executive Officer [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)					5 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) \| shares					25,000
Share Price (in dollars per share) \| $ / shares					$ 49.80
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total					$ 1,245,000
The 2010 Stock Incentive Plan [Member]
Increased Number of Shares Available for Issuance Due to Plan Amendment (in shares) \| shares															250,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) \| shares													208,584
The 2019 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) \| shares													369,584
The 2019 Stock Incentive Plan [Member] \| Shares Expired or Forfeited up to 100000 Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) \| shares													11,000
The 2019 Stock Incentive Plan [Member] \| Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) \| shares							208,584	208,584			208,584
The 2019 Stock Incentive Plan [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) \| shares							184,808	184,808			184,808
Subsequent Event [Member]
Common Stock, Dividends, Per Share, Declared (in dollars per share) \| $ / shares	$ 0.35