Note B - Adoption of New Accounting Standards - Impact of New Standard on Consolidated Balance Sheet (Details) - USD ($)	Dec. 29, 2019	Apr. 01, 2019	Mar. 31, 2019
Operating Lease, Right-of-Use Asset	$ 9,274,000	$ 7,804,000
Other assets	455,000	496,000	465,000
Operating Lease, Liability, Current	1,449,000	1,162,000
Operating Lease, Liability, Noncurrent	8,663,000	7,371,000
Other liabilities	$ 801,000	692,000	$ 1,390,000
Previous Accounting Guidance [Member]
Operating Lease, Right-of-Use Asset
Other assets		465,000
Operating Lease, Liability, Current
Operating Lease, Liability, Noncurrent
Other liabilities		1,390,000
Adjustments for New Accounting Pronouncement [Member]
Operating Lease, Right-of-Use Asset		7,804,000
Other assets
Operating Lease, Liability, Current		1,162,000
Operating Lease, Liability, Noncurrent		7,371,000
Other liabilities		(729,000)
Balance Sheet Reclassification Adjustments [Member]
Operating Lease, Right-of-Use Asset
Other assets		31,000
Operating Lease, Liability, Current
Operating Lease, Liability, Noncurrent
Other liabilities		$ 31,000