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Note 4 - Loan Receivables and Allowance for Loan Losses (Details) - Delinquency Status of Non-accrual Loans and Past Due Matured Loans - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Commercial
Non accrual loans	$ 1,593	$ 866
Pass [Member]
Commercial
Non accrual loans	0	0
Substandard [Member]
Commercial
Non accrual loans	1,593	866
Non-Accrual Loans [Member]
Commercial
Non accrual loans past due	1,593	728
Non accrual loans current	0	138
Non-Accrual Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Commercial
Non accrual loans past due	0	0
Non-Accrual Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Commercial
Non accrual loans past due	0	0
Non-Accrual Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Commercial
Non accrual loans past due	1,593	728
Commercial Portfolio Segment [Member]
Commercial
Non accrual loans	0	2
Commercial Portfolio Segment [Member] | Pass [Member]
Commercial
Non accrual loans	0	0
Commercial Portfolio Segment [Member] | Substandard [Member]
Commercial
Non accrual loans	0	2
Commercial Portfolio Segment [Member] | Non-Accrual Loans [Member]
Commercial
Non accrual loans past due	0	2
Non accrual loans current	0	0
Commercial Portfolio Segment [Member] | Non-Accrual Loans [Member] | Pass [Member]
Commercial
Non accrual loans past due	0
Non accrual loans current	0
Commercial Portfolio Segment [Member] | Non-Accrual Loans [Member] | Substandard [Member]
Commercial
Non accrual loans past due	0	2
Non accrual loans current	0	0
Commercial Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Commercial
Non accrual loans past due	0	0
Commercial Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Pass [Member]
Commercial
Non accrual loans past due	0
Commercial Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Substandard [Member]
Commercial
Non accrual loans past due	0	0
Commercial Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Commercial
Non accrual loans past due	0	0
Commercial Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Pass [Member]
Commercial
Non accrual loans past due	0
Commercial Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Substandard [Member]
Commercial
Non accrual loans past due	0	0
Commercial Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Commercial
Non accrual loans past due	0	2
Commercial Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Pass [Member]
Commercial
Non accrual loans past due	0
Commercial Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Substandard [Member]
Commercial
Non accrual loans past due	0	2
Commercial Real Estate Portfolio Segment [Member]
Commercial
Non accrual loans	0	138
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Commercial
Non accrual loans	0	0
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Commercial
Non accrual loans	0	138
Commercial Real Estate Portfolio Segment [Member] | Non-Accrual Loans [Member]
Commercial
Non accrual loans past due	0	0
Non accrual loans current	0	138
Commercial Real Estate Portfolio Segment [Member] | Non-Accrual Loans [Member] | Substandard [Member]
Commercial
Non accrual loans past due	0	0
Non accrual loans current	0	138
Commercial Real Estate Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Commercial
Non accrual loans past due	0	0
Commercial Real Estate Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Substandard [Member]
Commercial
Non accrual loans past due	0	0
Commercial Real Estate Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Commercial
Non accrual loans past due	0	0
Commercial Real Estate Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Substandard [Member]
Commercial
Non accrual loans past due	0	0
Commercial Real Estate Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Commercial
Non accrual loans past due	0	0
Commercial Real Estate Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Substandard [Member]
Commercial
Non accrual loans past due	0	0
Residential Portfolio Segment [Member]
Commercial
Non accrual loans	1,590	719
Residential Portfolio Segment [Member] | Pass [Member]
Commercial
Non accrual loans	0	0
Residential Portfolio Segment [Member] | Substandard [Member]
Commercial
Non accrual loans	1,590	719
Residential Portfolio Segment [Member] | Non-Accrual Loans [Member]
Commercial
Non accrual loans past due	1,590	719
Non accrual loans current	0	0
Residential Portfolio Segment [Member] | Non-Accrual Loans [Member] | Substandard [Member]
Commercial
Non accrual loans past due	1,590	719
Non accrual loans current	0	0
Residential Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Commercial
Non accrual loans past due	0	0
Residential Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Substandard [Member]
Commercial
Non accrual loans past due	0	0
Residential Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Commercial
Non accrual loans past due	0	0
Residential Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Substandard [Member]
Commercial
Non accrual loans past due	0	0
Residential Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Commercial
Non accrual loans past due	1,590	719
Residential Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Substandard [Member]
Commercial
Non accrual loans past due	1,590	719
Consumer Portfolio Segment [Member]
Commercial
Non accrual loans	3	7
Consumer Portfolio Segment [Member] | Pass [Member]
Commercial
Non accrual loans	0	0
Consumer Portfolio Segment [Member] | Substandard [Member]
Commercial
Non accrual loans	3	7
Consumer Portfolio Segment [Member] | Non-Accrual Loans [Member]
Commercial
Non accrual loans past due	3	7
Non accrual loans current	0	0
Consumer Portfolio Segment [Member] | Non-Accrual Loans [Member] | Substandard [Member]
Commercial
Non accrual loans past due	3	7
Non accrual loans current	0	0
Consumer Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Commercial
Non accrual loans past due	0	0
Consumer Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Substandard [Member]
Commercial
Non accrual loans past due	0	0
Consumer Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Commercial
Non accrual loans past due	0	0
Consumer Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Substandard [Member]
Commercial
Non accrual loans past due	0	0
Consumer Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Commercial
Non accrual loans past due	3	7
Consumer Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Substandard [Member]
Commercial
Non accrual loans past due	$ 3	$ 7

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