Note 6 - Loans Receivable and Allowances for Loan Losses (Details) - Past Due Loans - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, total past due	$ 24,386	$ 24,815
Loans receivable, current	875,117	850,212
Loans receivable	899,503	875,027
Loans receivable greater than 90 days and accruing	8,037	0
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, total past due	4,513	2,878
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, total past due	17	9,315
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, total past due	19,856	12,622
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, total past due	12,751	13,570
Loans receivable, current	345,989	336,156
Loans receivable	358,740	349,726
Loans receivable greater than 90 days and accruing	6,650	0
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, total past due	348	0
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, total past due	17	7,657
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, total past due	12,386	5,913
Construction and Land Development Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, total past due	117	117
Loans receivable, current	45,698	46,430
Loans receivable	45,815	46,547
Loans receivable greater than 90 days and accruing	0	0
Construction and Land Development Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, total past due	0	0
Construction and Land Development Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, total past due	0	0
Construction and Land Development Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, total past due	117	117
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, total past due	5,314	5,814
Loans receivable, current	176,514	176,036
Loans receivable	181,828	181,850
Loans receivable greater than 90 days and accruing	242	0
Commercial Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, total past due	2,624	1,661
Commercial Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, total past due	0	997
Commercial Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, total past due	2,690	3,156
Owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, total past due	4,606	4,163
Loans receivable, current	256,609	242,235
Loans receivable	261,215	246,398
Loans receivable greater than 90 days and accruing	834	0
Owner Occupied Real Estate [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, total past due	986	800
Owner Occupied Real Estate [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, total past due	0	469
Owner Occupied Real Estate [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, total past due	3,620	2,894
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, total past due	1,598	1,019
Loans receivable, current	47,954	47,107
Loans receivable	49,552	48,126
Loans receivable greater than 90 days and accruing	311	0
Consumer Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, total past due	555	285
Consumer Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, total past due	0	192
Consumer Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, total past due	1,043	542
Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, total past due	0	132
Loans receivable, current	2,353	2,248
Loans receivable	2,353	2,380
Loans receivable greater than 90 days and accruing	0	0
Residential Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, total past due	0	132
Residential Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, total past due	0	0
Residential Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, total past due	$ 0	$ 0