Note L - Stockholders' Equity, Stock Plans and Other Employee Benefit Plans (Details Textual)																9 Months Ended	12 Months Ended			15 Months Ended	113 Months Ended	210 Months Ended
		Jun. 14, 2019 $ / shares	May 31, 2018 USD ($) $ / shares	Jan. 04, 2018 USD ($)	Dec. 22, 2017 $ / shares shares	Dec. 20, 2017 $ / shares	Nov. 01, 2017 USD ($) $ / shares	Aug. 04, 2016 USD ($)	Jun. 01, 2016 USD ($)	Jun. 10, 2015 USD ($) $ / shares shares	Mar. 29, 2015 $ / shares shares	Mar. 27, 2015 USD ($) $ / shares	Mar. 10, 2015 $ / shares	Jun. 04, 2013 USD ($) $ / shares shares	Nov. 01, 2012 USD ($) shares	Dec. 23, 2018	Mar. 31, 2019 USD ($) $ / shares shares	Mar. 25, 2018 USD ($) $ / shares shares	Mar. 26, 2017 USD ($) $ / shares shares	Mar. 31, 2019 USD ($) $ / shares shares	Mar. 31, 2019 USD ($) $ / shares shares	Mar. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2017 USD ($)	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 | $ / shares			$ 1
Common Stock, Dividends, Amount per Quarter | $ / shares			0.25
Common Stock, Dividends, Per Share, Cash Paid | $ / shares			$ 0.25
Payments of Ordinary Dividends, Common Stock			$ 4,187,000
Payments of Special Dividends			$ 150,000
Common Stock, Dividends, Per Share, Declared | $ / shares																	$ 1	$ 5
Increased Number of Shares Available for Issuance Due to Plan Amendment | shares																										250,000
Amount of Available Common Shares Reduced by Each Share of Restricted Stock Granted | shares																										3.2
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period																	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares																	10,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares																	$ 89.90
Share Based Compensation Arrangement by Share Based Payment Award Option Life																	5 years
Share Price | $ / shares						$ 83.20						$ 73.56
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition																	2 years 150 days
Share-based Payment Arrangement, Expense, Tax Benefit																	$ 44,000	$ 144,000	$ 213,000
Share Based Compensation Total Unamortized Compensation Expense																	$ 285,000			$ 285,000	$ 285,000	$ 285,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period | shares	[1]																	64,384
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price | $ / shares	[1]																	$ 35.58
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | shares																	36,264	11,361	48,285
Proceeds from Stock Options Exercised																	$ 134,000	$ 0	$ 44,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value																	$ 1,488,000	379,000	1,555,000
Minimum Percentage of Common Stock Acquired by a Person or Group which Triggers Exercise of New Rights																									15.00%
New Right Purchase Price | $ / shares																									$ 100
Treasury Stock, Shares, Acquired | shares																	14,390					5,141,763
Treasury Stock, Value, Acquired, Cost Method																	$ 1,000,000		1,272,000			$ 78,303,000
Number of Times of Salary and Bonus Lump Sum Cash Payment																	2.99			2.99	2.99	2.99
Defined Contribution Plan, Employer Discretionary Contribution Amount																	$ 42,000	$ 40,000	41,000
Common Stock, Par or Stated Value Per Share | $ / shares																	$ 0.01	$ 0.01		$ 0.01	$ 0.01	$ 0.01
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent																		20.00%
Defined Contribution Plan, Employer Matching Contribution Rate Per Dollar | $ / shares																		$ 0.25
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay																		3.00%
Multiemployer Plans, Withdrawal Obligation																	$ 378,000			$ 378,000	$ 378,000	$ 378,000
Multiemployer Plans, Plan Contributions																	$ 7,000	$ 12,000	10,000
Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit | $ / shares																	$ 33.438
Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit | $ / shares																	$ 89.90
Executive Chairman of the Board [Member]
Term of Consulting Period Pursuant to the Lorber Employment [Agreement]																				3 years
President and Chief Operating Officer [Member]
Share Price | $ / shares										$ 40.28
Consulting Fee Per Month								$ 8,100		$ 16,300
Transition Agreement, Severance Payable										$ 289,000
Transition Agreement, Number of Shares of Common Stock Purchased | shares										56,933
Common Stock, Par or Stated Value Per Share | $ / shares										$ 0.01
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
Base Salary [Member] | One Employee [Member]
Contractual Obligation, Total																													$ 136,000
Consulting Fee [Member] | Executive Chairman of the Board [Member]
Contractual Obligation, Total															$ 200,000
Sixth Stock Repurchase Plan [Member]
Treasury Stock, Shares, Acquired | shares																					954,132
Treasury Stock, Value, Acquired, Cost Method																					$ 30,641,000
Stock Repurchase Program, Number of Shares Authorized to be Repurchased | shares																								1,200,000
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | shares																	245,868			245,868	245,868	245,868
Excluding Dividend [Member]
Share Price | $ / shares						78.20						$ 48.56
Newly Authorized Additional Shares Pursuant to 2010 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares																											150,000
Stock Option Plan 2001 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares																												171,000
Shares Expired or Forfeited up to 100000 Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares																											100,000
Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares																	208,584			208,584	208,584	208,584
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period																3 years
Share-based Payment Arrangement, Option [Member] | The 2010 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares					68,498						75,745
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares					$ 33.438						$ 35.58
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period | shares					64,384						50,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price | $ / shares					$ 35.58						$ 53.89
Share-based Payment Arrangement, Option [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period																	5 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period																		3 years
Share-based Payment Arrangement, Option [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period																	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period																		5 years
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares																	187,933			187,933	187,933	187,933
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period																	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares																	1,000
Share Price | $ / shares																	$ 89.90			$ 89.90	$ 89.90	$ 89.90
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition																	3 years
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total																	$ 90,000			$ 90,000	$ 90,000	$ 90,000
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 | shares															50,000
Contractual Obligation, Total																							$ 1,000,000
Restricted Stock [Member] | Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares														25,000
Share Price | $ / shares														$ 49.80
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition														5 years
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total														$ 1,245,000
Special Cash Dividend [Member]
Payments of Special Dividends				$ 20,923,000								$ 115,100,000
Common Stock, Dividends, Per Share, Declared | $ / shares						$ 5	$ 5					$ 25	$ 25
Dividends Payable												$ 1,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value																	434,000	$ 321,000	$ 736,000
Special Cash Dividends on Restricted Stock Declared on November 1, 2017 [Member]
Payments of Special Dividends																	$ 25,000
Dividends Payable							$ 25,000
Subsequent Event [Member]
Common Stock, Dividends, Per Share, Declared | $ / shares		$ 0.35

[1] Represents the effects on outstanding options after giving to the replacement options issued in connection with the Company's special dividend to the shareholders of record on December 22, 2017.