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Note 13 - Operating Leases (Detail) - Minimum annual rentals for all operating leases having initial non-cancelable lease terms in excess (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
2013         $ 941
2014       688  
2015     635    
2016   580      
2017 548        
Thereafter 2,614        
Total future minimum rental payments $ 6,006