Note 3 - Securities - Securities With Unrealized and Unrecognized Losses (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jun. 30, 2019
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 9,775
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	(42)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	17,220	45,838
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	(94)	(510)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	26,995	45,838
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss	(136)	(510)
US Government-sponsored Enterprises Debt Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,655
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	(27)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		998
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss		(1)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,655	998
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss	(27)	(1)
US States and Political Subdivisions Debt Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	2,517
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	(4)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	208	5,201
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	(1)	(33)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	2,725	5,201
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss	(5)	(33)
Residential Mortgage Backed Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	3,712
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	(6)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	15,695	36,362
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	(82)	(448)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	19,407	36,362
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss	(88)	(448)
Commercial Mortgage Backed Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,456
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	(4)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,456
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss	(4)
Collateralized Debt Obligations [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	435
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	(1)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	1,317	3,277
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	(11)	(28)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,752	3,277
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss	$ (12)	$ (28)