Note J - Income Taxes (Details Textual) - USD ($)	9 Months Ended		12 Months Ended
	Dec. 25, 2016	Dec. 27, 2015	Mar. 26, 2017	Mar. 27, 2016
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	37.10%	41.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Percent	6.10%
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Percent	1.10%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Investments, Percent				1.00%
Effective Income Tax Rate Reconciliation, Tax Contingency, Percent				0.20%
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent				0.10%
Excess Tax Benefit from Share-based Compensation, Operating Activities	$ (659,000)
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	207,000
Income Tax Examination, Penalties and Interest Accrued	228,000
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	(31,000)
Scenario, Forecast [Member] | Minimum [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			42.00%
Scenario, Forecast [Member] | Maximum [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			44.00%
Provision for Income Taxes [Member]
Excess Tax Benefit from Share-based Compensation, Operating Activities	$ 659,000