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Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Non-accrual Loans and Past Due Matured Loans - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Commercial & Industrial
Non accrual loans	$ 5,409	$ 1,593
Pass [Member]
Commercial & Industrial
Non accrual loans	2	0
Substandard [Member]
Commercial & Industrial
Non accrual loans	5,409	1,593
Non-Accrual Loans [Member]
Commercial & Industrial
Non accrual loans past due	5,409	1,593
Non accrual loans current	0	0
Non-Accrual Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Commercial & Industrial
Non accrual loans past due	0	0
Non-Accrual Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Commercial & Industrial
Non accrual loans past due	0	0
Non-Accrual Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Commercial & Industrial
Non accrual loans past due	5,409	1,593
Commercial Portfolio Segment [Member]
Commercial & Industrial
Non accrual loans	2,977	0
Commercial Portfolio Segment [Member] | Pass [Member]
Commercial & Industrial
Non accrual loans	0	0
Commercial Portfolio Segment [Member] | Substandard [Member]
Commercial & Industrial
Non accrual loans	2,977	0
Commercial Portfolio Segment [Member] | Non-Accrual Loans [Member]
Commercial & Industrial
Non accrual loans past due	2,977	0
Non accrual loans current	0	0
Commercial Portfolio Segment [Member] | Non-Accrual Loans [Member] | Pass [Member]
Commercial & Industrial
Non accrual loans past due	0	0
Non accrual loans current	0	0
Commercial Portfolio Segment [Member] | Non-Accrual Loans [Member] | Substandard [Member]
Commercial & Industrial
Non accrual loans past due	2,977	0
Non accrual loans current	0	0
Commercial Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Commercial & Industrial
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 & Industrial
Non accrual loans past due	0	0
Commercial Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Substandard [Member]
Commercial & Industrial
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 & Industrial
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 & Industrial
Non accrual loans past due	0	0
Commercial Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Substandard [Member]
Commercial & Industrial
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 & Industrial
Non accrual loans past due	2,977	0
Commercial Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Pass [Member]
Commercial & Industrial
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] | Substandard [Member]
Commercial & Industrial
Non accrual loans past due	2,977	0
Commercial Real Estate Portfolio Segment [Member]
Commercial & Industrial
Non accrual loans	840	0
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Commercial & Industrial
Non accrual loans	0	0
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Commercial & Industrial
Non accrual loans	840	0
Commercial Real Estate Portfolio Segment [Member] | Non-Accrual Loans [Member]
Commercial & Industrial
Non accrual loans past due	840	0
Non accrual loans current	0	0
Commercial Real Estate Portfolio Segment [Member] | Non-Accrual Loans [Member] | Substandard [Member]
Commercial & Industrial
Non accrual loans past due	840	0
Non accrual loans current	0	0
Commercial Real Estate Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Commercial & Industrial
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 & Industrial
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 & Industrial
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 & Industrial
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 & Industrial
Non accrual loans past due	840	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 & Industrial
Non accrual loans past due	840	0
Residential Portfolio Segment [Member]
Commercial & Industrial
Non accrual loans	1,590	1,590
Residential Portfolio Segment [Member] | Pass [Member]
Commercial & Industrial
Non accrual loans	0	0
Residential Portfolio Segment [Member] | Substandard [Member]
Commercial & Industrial
Non accrual loans	1,590	1,590
Residential Portfolio Segment [Member] | Non-Accrual Loans [Member]
Commercial & Industrial
Non accrual loans past due	1,590	1,590
Non accrual loans current	0	0
Residential Portfolio Segment [Member] | Non-Accrual Loans [Member] | Substandard [Member]
Commercial & Industrial
Non accrual loans past due	1,590	1,590
Non accrual loans current	0	0
Residential Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Commercial & Industrial
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 & Industrial
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 & Industrial
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 & Industrial
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 & Industrial
Non accrual loans past due	1,590	1,590
Residential Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Substandard [Member]
Commercial & Industrial
Non accrual loans past due	1,590	1,590
Consumer Portfolio Segment [Member]
Commercial & Industrial
Non accrual loans	2	3
Consumer Portfolio Segment [Member] | Pass [Member]
Commercial & Industrial
Non accrual loans	2	0
Consumer Portfolio Segment [Member] | Substandard [Member]
Commercial & Industrial
Non accrual loans	2	3
Consumer Portfolio Segment [Member] | Non-Accrual Loans [Member]
Commercial & Industrial
Non accrual loans past due	2	3
Non accrual loans current	0	0
Consumer Portfolio Segment [Member] | Non-Accrual Loans [Member] | Substandard [Member]
Commercial & Industrial
Non accrual loans past due	2	3
Non accrual loans current	0	0
Consumer Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Commercial & Industrial
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 & Industrial
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 & Industrial
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 & Industrial
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 & Industrial
Non accrual loans past due	2	3
Consumer Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Substandard [Member]
Commercial & Industrial
Non accrual loans past due	$ 2	$ 3

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