Note J - Income Taxes (Details Textual) - USD ($)		9 Months Ended		12 Months Ended
	Jan. 01, 2018	Dec. 24, 2017	Dec. 25, 2016	Mar. 25, 2018
Effective Income Tax Rate Reconciliation, Percent		21.50%	37.10%
Effective Income Tax Rate, Effect of Stock Compensation		6.70%	6.10%
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense		$ 194,000	$ 659,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate		207,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued		212,000
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit		$ 5,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		35.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability		$ (436,000)
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability, Percent		(15.10%)
Scenario, Forecast [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent				31.00%
Scenario, Forecast [Member] | Minimum [Member]
Effective Income Tax Rate Reconciliation, Percent				40.80%
Scenario, Forecast [Member] | Maximum [Member]
Effective Income Tax Rate Reconciliation, Percent				43.10%
Subsequent Event [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%