Note 10 - Leases and Purchase Commitments (Details Textual) - USD ($)	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Contractual Obligation, Total	$ 21,451,000	$ 21,973,000
Operating Leases, Rent Expense, Total	$ 2,867,000	$ 2,439,000	$ 2,027,000
Minimum [Member]
Lessee, Operating Lease, Renewal Term	1 year
Maximum [Member]
Lessee, Operating Lease, Renewal Term	5 years