Note J - Income Taxes (Details Textual) - USD ($)	6 Months Ended		12 Months Ended
	Sep. 24, 2017	Sep. 25, 2016	Mar. 25, 2018
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	39.40%	36.90%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Percent	1.90%	6.40%
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	$ 194,000	$ 621,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	201,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	208,000
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	$ 5,000
Scenario, Forecast [Member] | Minimum [Member]
Effective Income Tax Rate Reconciliation, Percent			40.80%
Scenario, Forecast [Member] | Maximum [Member]
Effective Income Tax Rate Reconciliation, Percent			42.30%