Note M - Stockholders' Equity, Stock Plans and Other Employee Benefit Plans (Details Textual) $ / shares in Units, $ in Thousands														2 Months Ended	10 Months Ended	12 Months Ended			51 Months Ended	222 Months Ended
	Jun. 12, 2020 $ / shares	Jun. 14, 2019 $ / shares	May 31, 2018 $ / shares	Jan. 04, 2018 USD ($)	Dec. 22, 2017 $ / shares shares	Dec. 20, 2017 $ / shares	Nov. 01, 2017 USD ($) $ / shares	Jun. 01, 2016 USD ($)	Mar. 29, 2015 $ / shares shares	Mar. 27, 2015 USD ($) $ / shares	Mar. 10, 2015 $ / shares	Jun. 04, 2013 USD ($) $ / shares shares	Nov. 01, 2012 USD ($) shares	Jun. 05, 2020 USD ($) $ / shares shares	Mar. 31, 2019 USD ($) $ / shares	Mar. 29, 2020 USD ($) $ / shares shares	Mar. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2017 USD ($)	Mar. 29, 2020 USD ($) $ / shares shares	Mar. 29, 2020 USD ($) $ / shares shares	Mar. 13, 2020 USD ($) shares	Dec. 31, 2019 USD ($)	Sep. 18, 2019 shares	Mar. 25, 2018 $ / shares	Mar. 11, 2016 shares	Jun. 05, 2013 $ / shares	Sep. 13, 2012 shares	Sep. 14, 2010 shares	Jul. 19, 2010 shares	May 31, 2007 USD ($)
Common Stock, Dividends, Amount per Annum (in dollars per share) | $ / shares			$ 1
Common Stock, Dividends, Amount per Quarter (in dollars per share) | $ / shares			$ 0.25													$ 0.35
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share) | $ / shares															$ 0.25
Payments of Ordinary Dividends, Common Stock															$ 4,187	$ 5,912
Payments of Special Dividends															$ 150
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ / shares		$ 0.35														$ 1.40	$ 1
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)																	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) | shares																	10,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) | $ / shares																	$ 89.90
Share Based Compensation Arrangement by Share Based Payment Award Option Life (Year)																	5 years
Share Price (in dollars per share) | $ / shares						$ 83.20				$ 73.56
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)																1 year 150 days
Share-based Payment Arrangement, Expense, Tax Benefit																$ 29	$ 44
Share Based Compensation Total Unamortized Compensation Expense																$ 169			$ 169	$ 169
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share) | $ / shares															$ 46.807	$ 89.90	$ 46.807		$ 89.90	$ 89.90				$ 33.438
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares) | shares																32,234	36,264
Proceeds from Stock Options Exercised																$ 1,078	$ 134
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value																1,134	1,488
Minimum Percentage of Common Stock Acquired by a Person or Group which Triggers Exercise of New Rights																										15.00%
New Right Purchase Price (in dollars per share) | $ / shares																										$ 100
Treasury Stock, Shares, Acquired (in shares) | shares																				5,227,405
Treasury Stock, Value, Acquired, Cost Method																$ 4,966	1,000			$ 83,269
Number of Times of Salary and Bonus Lump Sum Cash Payment																2.99			2.99	2.99
Defined Contribution Plan, Employer Discretionary Contribution Amount																$ 44	42
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																$ 0.25
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay																3.00%
Multiemployer Plans, Withdrawal Obligation																						$ 396
Multiemployer Plan, Employer Contribution, Cost, Total																$ 6	$ 7
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
Base Salary [Member] | Chief Executive Officer [Member]
Defined Contribution Plan, Employer Discretionary Contribution Amount								$ 500
Base Salary [Member] | One Employee [Member]
Contractual Obligation, Total																														$ 136
Consulting Fee [Member] | Executive Chairman of the Board [Member]
Contractual Obligation, Total													$ 200
Sixth Stock Repurchase Plan [Member]
Treasury Stock, Shares, Acquired (in shares) | shares																85,642			1,039,774
Treasury Stock, Value, Acquired, Cost Method																$ 4,966			$ 35,607
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																160,226			160,226	160,226
Repurchase Program [Member]
Treasury Stock, Shares, Acquired (in shares) | shares																50,918
Treasury Stock, Value, Acquired, Cost Method																$ 2,727
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) | shares																					100,000
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased (in shares) | shares																49,082,000			49,082,000	49,082,000
Stock Repurchase Program, Authorized Amount																					$ 5,550
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) | $ / shares																$ 53.54
Stock Repurchase Program, Remaining Authorized Repurchase Amount																$ 2,823			$ 2,823	$ 2,823
Excluding Dividend [Member]
Share Price (in dollars per share) | $ / shares						78.20				$ 48.56
The 2010 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) | shares																							208,584
Increased Number of Shares Available for Issuance Due to Plan Amendment (in shares) | shares																											250,000
Amount of Available Common Shares Reduced by Each Share of Restricted Stock Granted (in shares) | shares																											3.2
The 2019 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) | shares																							369,584
Newly Authorized Additional Shares Pursuant to 2010 Plan [Member] | The 2010 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) | shares																												150,000
Stock Option Plan 2001 [Member] | The 2010 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) | shares																													171,000
Shares Expired or Forfeited up to 100000 Shares [Member] | The 2010 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) | shares																												100,000
Shares Expired or Forfeited up to 100000 Shares [Member] | The 2019 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) | shares																							11,000
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
Share-based Payment Arrangement, Option [Member] | The 2010 Stock Incentive Plan [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
Share-based Payment Arrangement, Option [Member] | The 2010 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) | shares					68,498				75,745
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) | $ / shares					$ 33.438				$ 35.58
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period (in shares) | shares					64,384				50,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price (in dollars per share) | $ / shares					$ 35.58				$ 53.89
Restricted Stock [Member]
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, Grants in Period (in shares) | shares																	1,000
Share Price (in dollars per share) | $ / shares															$ 89.90		$ 89.90
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)																	3 years
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total															$ 90		$ 90
Restricted Stock [Member] | Executive Chairman of the Board [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | shares													50,000
Contractual Obligation, Total																		$ 1,000
Restricted Stock [Member] | Chief Executive Officer [Member]
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, Period for Recognition (Year)												5 years
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total												$ 1,245
Restricted Stock [Member] | The 2010 Stock Incentive Plan [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
Special Cash Dividend [Member]
Payments of Special Dividends				$ 20,923						$ 115,100
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ / shares						$ 5	$ 5			$ 25	$ 25
Dividends Payable										$ 1,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value																$ 23	$ 434
Special Cash Dividends on Restricted Stock Declared on November 1, 2017 [Member]
Dividends Payable							$ 25
Subsequent Event [Member]
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ / shares	$ 0.35
Subsequent Event [Member] | Repurchase Program [Member]
Treasury Stock, Shares, Acquired (in shares) | shares														26,676
Treasury Stock, Value, Acquired, Cost Method														$ 1,502
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased (in shares) | shares														22,406,000
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) | $ / shares														$ 56.26
Stock Repurchase Program, Remaining Authorized Repurchase Amount														$ 1,316