Note 10 - Leases and Purchase Commitments (Details Textual) - USD ($)	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Contractual Obligation	$ 21,973,000	$ 20,824,000
Operating Leases, Rent Expense	$ 2,439,000	$ 2,027,000	$ 1,876,000
Minimum [Member]
Lessee, Operating Lease, Renewal Term	1 year
Maximum [Member]
Lessee, Operating Lease, Renewal Term	5 years