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Note 8 - Commitments (Details) - The minimum future annual rental payments under the non-cancelable leases (USD $)
In Millions, unless otherwise specified
Mar. 31, 2018
Mar. 25, 2017
Mar. 26, 2016
Mar. 28, 2015
Mar. 29, 2014
The minimum future annual rental payments under the non-cancelable leases [Abstract]          
2014         $ 1.6
2015       1.3  
2016     1.1    
2017   0.9      
2018 0.6        
Thereafter 0.9        
Total minimum lease payments $ 6.4