Note 5 - Leases - Undiscounted Future Lease Payments Under Operating Leases and Financial Leases (Details) - USD ($) $ in Thousands	Jan. 01, 2022	Mar. 31, 2021	Dec. 26, 2020
Balance of 2022, operating	$ 3,120
Balance of 2022, financing	2,314
2023, operating	15,254
2023, financing	9,255
2024, operating	8,959
2024, financing	7,686
2025, operating	5,119
2025, financing	4,302
2026, operating	2,902
2026, financing	3,215
2027-2033, operating	7,512
2027-2033, financing	5,670
Total minimum payment required, operating	42,866
Total minimum payment required, financing	32,442
Less interest, operating	3,597
Less interest, financing	2,480
Present value of minimum lease payments, operating	39,269
Present value of minimum lease payments, financing	29,962
Amount due within one year, operating	14,736	$ 17,047	$ 18,327
Amount due within one year, financing	8,375	6,778	6,608
Long-term lease obligations	24,533	27,769	30,436
Long-term lease obligations	21,587	$ 19,232	$ 20,546
Current Portion of Long-term Debt and Lease Obligations [Member]
Amount due within one year, operating	$ 14,736