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Note 5 - Employee Benefit Plans (Details) - Summary future benefit payments (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2018
Mar. 25, 2017
Mar. 26, 2016
Mar. 28, 2015
Mar. 29, 2014
Summary future benefit payments [Abstract]          
2014         $ 51
2015       57  
2016     62    
2017   62      
2018 56        
Thereafter $ 599