Note 12 - Employee Benefit and Retirement Plans - Portfolio by Valuation Category (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Asset Allocation	100.00%	100.00%
Fair Value	$ 117,778	$ 115,015
Fair Value, Inputs, Level 1 [Member]
Fair Value	59,227	59,368
Fair Value, Inputs, Level 2 [Member]
Fair Value	58,551	52,837
Fair Value, Inputs, Level 3 [Member]
Fair Value		$ 2,810	$ 4,084
Cash Equivalents [Member]
Asset Allocation	1.00%	0.00%
Fair Value	$ 780	$ 672
Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value	780	672
Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value
Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value
Fixed Income Securities [Member]
Asset Allocation	18.00%	18.00%
Fair Value	$ 21,128	$ 20,342
Fixed Income Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value
Fixed Income Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value	21,128	20,342
Fixed Income Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value
Equity Securities [Member]
Asset Allocation	24.00%	27.00%
Fair Value	$ 28,289	$ 31,074
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value	26,580	28,639
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value	1,709	2,435
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value
Mutual and Pooled Funds [Member]
Asset Allocation	57.00%	55.00%
Fair Value	$ 67,581	$ 62,927
Mutual and Pooled Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value	31,867	30,057
Mutual and Pooled Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value	35,714	30,060
Mutual and Pooled Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value		$ 2,810