Note 6 - Leases - Undiscounted Future Lease Payments Under Operating Leases and Financial Leases (Details) - USD ($) $ in Thousands	Sep. 26, 2020	Mar. 31, 2020	Sep. 28, 2019
Balance of 2021, operating	$ 8,623
Balance of 2021, financing	3,744
2022, operating	19,230
2022, financing	7,488
2023, operating	13,738
2023, financing	7,488
2024, operating	6,820
2024, financing	5,961
2025, operating	3,260
2025, financing	2,607
2026-2032, operating	4,598
2026-2032, financing	4,120
Total minimum payment required, operating	56,269
Total minimum payment required, financing	31,408
Less interest, operating	4,329
Less interest, financing	3,011
Present value of minimum lease payments, operating	51,940
Present value of minimum lease payments, financing	28,397
Amount due within one year, operating	18,476	$ 21,550	$ 25,776
Amount due within one year, financing	6,497	6,224	6,137
Long-term lease obligations	33,464	42,760	52,992
Long-term lease obligations	21,900	$ 24,366	$ 26,773
Current Portion of Long-term Debt and Lease Obligations [Member]
Amount due within one year, operating	$ 18,476