Note 3 - Securities - Securities With Unrealized and Unrecognized Losses (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 3,506
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	(14)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	625	45,838
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	(4)	(510)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	4,131	45,838
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss	(18)	(510)
Residential Mortgage Backed Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	625	36,362
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	(4)	(448)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	625	36,362
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss	(4)	(448)
US Government-sponsored Enterprises Debt Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss
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		998
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss		(1)
Commercial Mortgage Backed Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,806
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	(2)
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	1,806
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss	(2)
US States and Political Subdivisions Debt Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		5,201
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss		(33)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		5,201
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss		(33)
Collateralized Debt Obligations [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,700
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	(12)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		3,277
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss		(28)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,700	3,277
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss	$ (12)	$ (28)