Note 9 - Allowance for Loan Losses and Credit Quality Information - Deferred Loans (Details) - USD ($) $ in Thousands		Sep. 30, 2020	Jun. 30, 2020
Deferred loans		$ 82,045	$ 119,079
Commercial Real Estate Portfolio Segment [Member]
Deferred loans		81,679	116,047
Commercial Real Estate Portfolio Segment [Member] | Hotels [Member]
Deferred loans	[1]	54,660	54,660
Commercial Real Estate Portfolio Segment [Member] | Retail/Office [Member]
Deferred loans		7,127	20,322
Commercial Real Estate Portfolio Segment [Member] | Theaters [Member]
Deferred loans		11,269	11,269
Commercial Real Estate Portfolio Segment [Member] | Multi Family [Member]
Deferred loans		0	11,195
Commercial Real Estate Portfolio Segment [Member] | Restaurant/Bar [Member]
Deferred loans		2,876	4,477
Commercial Real Estate Portfolio Segment [Member] | Other Industry Sectors [Member]
Deferred loans		5,747	9,449
Commercial Real Estate Portfolio Segment [Member] | Single Family Mortgages [Member]
Deferred loans		366	2,955
Consumer Portfolio Segment [Member]
Deferred loans		366	3,032
Consumer Portfolio Segment [Member] | Residential Real Estate [Member]
Deferred loans		0	4,675
Consumer Portfolio Segment [Member] | Other Consumer [Member]
Deferred loans		$ 0	$ 77

[1] Approximately $38.5 million of the hotel properties are located in Minnesota with approximately $21.3 million located in Rochester, Minnesota, $13.8 million in the Minneapolis/St. Paul, Minnesota metro area, and $3.4 million in St. Cloud, Minnesota