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Note 17 - Employee Benefits - Fair Values of Pension Plans (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Jun. 30, 2015
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair value of pension plan assets $ 511 $ 451
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair value of pension plan assets 6,413 3,600
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair value of pension plan assets
Cash and Cash Equivalents [Member]    
Fair value of pension plan assets 6,924 4,051
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair value of pension plan assets 17,227 17,716
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair value of pension plan assets 74,309 84,009
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair value of pension plan assets
Equity Securities [Member]    
Fair value of pension plan assets 91,536 101,725
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair value of pension plan assets
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair value of pension plan assets 15,032 14,469
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair value of pension plan assets
US Government Agencies Debt Securities [Member]    
Fair value of pension plan assets 15,032 14,469
Corporate Bonds and Other Fixed Income Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair value of pension plan assets 6,328 6,238
Corporate Bonds and Other Fixed Income Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair value of pension plan assets 101,192 106,059
Corporate Bonds and Other Fixed Income Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair value of pension plan assets
Corporate Bonds and Other Fixed Income Securities [Member]    
Fair value of pension plan assets 107,520 112,297
Other Debt Obligations [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair value of pension plan assets
Other Debt Obligations [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair value of pension plan assets 11,845 9,534
Other Debt Obligations [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair value of pension plan assets
Other Debt Obligations [Member]    
Fair value of pension plan assets 11,845 9,534
Fair Value, Inputs, Level 1 [Member]    
Fair value of pension plan assets 24,066 24,405
Fair Value, Inputs, Level 2 [Member]    
Fair value of pension plan assets 208,791 217,671
Fair Value, Inputs, Level 3 [Member]    
Fair value of pension plan assets
Fair value of pension plan assets $ 232,857 $ 242,076