Note 12 - Employee Benefit and Retirement Plans - Actual Asset Allocation For The Assets Within The Company's Plans (Details)	Jun. 30, 2017	Jun. 30, 2016
Asset category:
Asset allocation	100.00%	100.00%
Cash and Cash Equivalents [Member]
Asset category:
Asset allocation	1.00%	0.00%
Fixed Income Securities [Member]
Asset category:
Asset allocation	18.00%	18.00%
Equity Securities [Member]
Asset category:
Asset allocation	24.00%	27.00%
Mutual and Pooled Funds [Member]
Asset category:
Asset allocation	57.00%	55.00%