Note 8 - Retirement Plans (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 29, 2018	Dec. 30, 2017
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 0	$ 0	$ 2,500,000	$ 2,500,000