Note 8 - Other Comprehensive Income - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jun. 30, 2018
After tax amount	$ (1,548)	$ (1,761)
Accumulated other comprehensive loss	(1,548)	(1,761)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Accumulated other comprehensive loss before tax	(777)	(1,584)
Tax effect	210	428
After tax amount	(567)	(1,156)
Accumulated other comprehensive loss	(567)	(1,156)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Accumulated other comprehensive loss before tax	(1,343)	(827)
Tax effect	362	222
After tax amount	(981)	(605)
Accumulated other comprehensive loss	$ (981)	$ (605)