Note 8 - Retail Loans by Credit Quality (Details) - USD ($)	Jun. 30, 2016	Dec. 31, 2015
Retail Portfolio Segment [Member] | Family Residential Mortgages [Member] | Performing Financial Instruments [Member]
Loans and leases receivable	$ 44,335,000	$ 42,546,000
Retail Portfolio Segment [Member] | Family Residential Mortgages [Member] | Nonperforming Financial Instruments [Member]
Loans and leases receivable	276,000	287,000
Retail Portfolio Segment [Member] | Family Residential Mortgages [Member]
Loans and leases receivable	44,611,000	42,833,000
Retail Portfolio Segment [Member] | Home Equity Loan [Member] | Performing Financial Instruments [Member]
Loans and leases receivable	67,805,000	67,257,000
Retail Portfolio Segment [Member] | Home Equity Loan [Member] | Nonperforming Financial Instruments [Member]
Loans and leases receivable	105,000	127,000
Retail Portfolio Segment [Member] | Home Equity Loan [Member]
Loans and leases receivable	67,910,000	67,384,000
Retail Portfolio Segment [Member] | Consumer Loans [Member] | Performing Financial Instruments [Member]
Loans and leases receivable	4,413,000	4,286,000
Retail Portfolio Segment [Member] | Consumer Loans [Member] | Nonperforming Financial Instruments [Member]
Loans and leases receivable	0	0
Retail Portfolio Segment [Member] | Consumer Loans [Member]
Loans and leases receivable	4,413,000	4,286,000
Total Retail Loans [Member] | Performing Financial Instruments [Member]
Loans and leases receivable	116,553,000	114,089,000
Total Retail Loans [Member] | Nonperforming Financial Instruments [Member]
Loans and leases receivable	381,000	414,000
Total Retail Loans [Member]
Loans and leases receivable	116,934,000	114,503,000
Loans and leases receivable	$ 604,409,000	$ 615,263,000