Note K - Income Taxes (Details Textual) - USD ($)		9 Months Ended		12 Months Ended
	Mar. 26, 2017	Dec. 23, 2018	Dec. 24, 2017	Mar. 31, 2019	Mar. 25, 2018
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent					31.00%
Effective Income Tax Rate Reconciliation, Percent, Total	36.60%	27.80%	21.50%
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%)
Effective Income Tax Rate, Effect of Stock Compensation		0.20%	6.70%
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense		$ 47,000	$ 194,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate		249,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total		$ 242,000
Scenario, Forecast [Member] | Minimum [Member]
Effective Income Tax Rate Reconciliation, Percent, Total				27.00%
Scenario, Forecast [Member] | Maximum [Member]
Effective Income Tax Rate Reconciliation, Percent, Total				29.00%