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Note 17 - Employee Benefits - Company's Participation in Multiemployer Pension Plans (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Multiemployer Plan, Period Contributions $ 1,163 $ 1,060 $ 1,070
New England Teamsters and Trucking Industry Pension Fund [Member]      
Multiemployer Plan, Period Contributions 530 485 437
IAM National Pension Fund National Pension Plan [Member]      
Multiemployer Plan, Period Contributions $ 633 $ 575 $ 633