Note 4 - Loans, Allowance for Loan Losses and Credit Quality - Summary of Past Due and Non-accrual Loans (Details) - USD ($)	Dec. 31, 2018	Jun. 30, 2018
Past due	$ 18,283,000	$ 7,734,000
Current	920,003,000	864,068,000
Loans	938,286,000	871,802,000
Non- Accrual Loans	12,346,000	11,958,000
Residential Portfolio Segment [Member]
Loans	92,566,000	100,128,000
Commercial Real Estate Portfolio Segment [Member]
Loans	572,712,000	525,479,000
Commercial Portfolio Segment [Member]
Loans	202,938,000	182,795,000
Consumer Portfolio Segment [Member]
Loans	2,788,000	3,244,000
Unallocated Financing Receivables [Member]
Loans	67,282,000	60,156,000
Financial Asset Originated [Member]
Past due	8,762,000	3,405,000
Current	598,881,000	577,425,000
Loans	607,643,000	580,830,000
Non- Accrual Loans	6,995,000	6,213,000
Financial Asset Originated [Member] | Residential Portfolio Segment [Member]
Past due	3,028,000	2,029,000
Current	72,944,000	84,173,000
Loans	75,972,000	86,202,000
Non- Accrual Loans	2,595,000	3,212,000
Financial Asset Originated [Member] | Commercial Real Estate Portfolio Segment [Member]
Past due	2,784,000	335,000
Current	256,667,000	249,093,000
Loans	259,451,000	249,428,000
Non- Accrual Loans	2,351,000	1,428,000
Financial Asset Originated [Member] | Commercial Portfolio Segment [Member]
Past due	40,000	32,000
Current	202,110,000	181,768,000
Loans	202,150,000	181,800,000
Non- Accrual Loans	40,000	34,000
Financial Asset Originated [Member] | Consumer Portfolio Segment [Member]
Past due	250,000	178,000
Current	2,538,000	3,066,000
Loans	2,788,000	3,244,000
Non- Accrual Loans	216,000	134,000
Financial Asset Originated [Member] | Unallocated Financing Receivables [Member]
Past due	2,660,000	831,000
Current	64,622,000	59,325,000
Loans	67,282,000	60,156,000
Non- Accrual Loans	1,793,000	1,405,000
Financial Asset Acquired with Credit Deterioration [Member]
Past due	9,521,000	4,329,000
Current	321,122,000	286,643,000
Loans	330,643,000	290,972,000
Non- Accrual Loans	5,351,000	5,745,000
Financial Asset Acquired with Credit Deterioration [Member] | Residential Portfolio Segment [Member]
Past due	202,000	202,000
Current	16,392,000	13,724,000
Loans	16,594,000	13,926,000
Non- Accrual Loans	202,000	202,000
Financial Asset Acquired with Credit Deterioration [Member] | Commercial Real Estate Portfolio Segment [Member]
Past due	9,180,000	4,019,000
Current	304,081,000	272,032,000
Loans	313,261,000	276,051,000
Non- Accrual Loans	4,755,000	5,180,000
Financial Asset Acquired with Credit Deterioration [Member] | Commercial Portfolio Segment [Member]
Past due	139,000	108,000
Current	649,000	887,000
Loans	788,000	995,000
Non- Accrual Loans	394,000	363,000
Financial Asset Acquired with Credit Deterioration [Member] | Consumer Portfolio Segment [Member]
Loans
Financing Receivables, 30 to 59 Days Past Due [Member]
Past due	8,129,000	1,273,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Financial Asset Originated [Member]
Past due	2,766,000	597,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Financial Asset Originated [Member] | Residential Portfolio Segment [Member]
Past due	1,141,000	493,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Financial Asset Originated [Member] | Commercial Real Estate Portfolio Segment [Member]
Past due	238,000	27,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Financial Asset Originated [Member] | Commercial Portfolio Segment [Member]
Past due
Financing Receivables, 30 to 59 Days Past Due [Member] | Financial Asset Originated [Member] | Consumer Portfolio Segment [Member]
Past due	62,000	77,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Financial Asset Originated [Member] | Unallocated Financing Receivables [Member]
Past due	1,325,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Past due	5,363,000	676,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Financial Asset Acquired with Credit Deterioration [Member] | Residential Portfolio Segment [Member]
Past due
Financing Receivables, 30 to 59 Days Past Due [Member] | Financial Asset Acquired with Credit Deterioration [Member] | Commercial Real Estate Portfolio Segment [Member]
Past due	5,363,000	659,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Financial Asset Acquired with Credit Deterioration [Member] | Commercial Portfolio Segment [Member]
Past due		17,000
Financing Receivables, 60 to 89 Days Past Due [Member]
Past due	1,890,000	747,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Financial Asset Originated [Member]
Past due	685,000	473,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Financial Asset Originated [Member] | Residential Portfolio Segment [Member]
Past due	247,000	181,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Financial Asset Originated [Member] | Commercial Real Estate Portfolio Segment [Member]
Past due	309,000	210,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Financial Asset Originated [Member] | Commercial Portfolio Segment [Member]
Past due
Financing Receivables, 60 to 89 Days Past Due [Member] | Financial Asset Originated [Member] | Consumer Portfolio Segment [Member]
Past due	67,000	82,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Financial Asset Originated [Member] | Unallocated Financing Receivables [Member]
Past due	62,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Past due	1,205,000	274,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Financial Asset Acquired with Credit Deterioration [Member] | Residential Portfolio Segment [Member]
Past due
Financing Receivables, 60 to 89 Days Past Due [Member] | Financial Asset Acquired with Credit Deterioration [Member] | Commercial Real Estate Portfolio Segment [Member]
Past due	1,205,000	274,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Financial Asset Acquired with Credit Deterioration [Member] | Commercial Portfolio Segment [Member]
Past due
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due	8,264,000	5,714,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Financial Asset Originated [Member]
Past due	5,311,000	2,335,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Financial Asset Originated [Member] | Residential Portfolio Segment [Member]
Past due	1,640,000	1,355,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Financial Asset Originated [Member] | Commercial Real Estate Portfolio Segment [Member]
Past due	2,237,000	98,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Financial Asset Originated [Member] | Commercial Portfolio Segment [Member]
Past due	40,000	32,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Financial Asset Originated [Member] | Consumer Portfolio Segment [Member]
Past due	121,000	19,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Financial Asset Originated [Member] | Unallocated Financing Receivables [Member]
Past due	1,273,000	831,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Past due	2,953,000	3,379,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Financial Asset Acquired with Credit Deterioration [Member] | Residential Portfolio Segment [Member]
Past due	202,000	202,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Financial Asset Acquired with Credit Deterioration [Member] | Commercial Real Estate Portfolio Segment [Member]
Past due	2,612,000	3,086,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Financial Asset Acquired with Credit Deterioration [Member] | Commercial Portfolio Segment [Member]
Past due	$ 139,000	$ 91,000