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Note 4 - Loans and Allowance for Loan Losses (Details) - Allowance for Loan Losses and the Recorded Investment of Loans Based On Impairment Method - USD ($) $ in Thousands	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013
Ending allowance balance attributable to loans:
Individually evaluated for impairment	$ 2,694		$ 3,412
Collectively evaluated for impairment	4,750		4,922
Total ending allowance balance	7,444	$ 8,320	8,334	$ 7,928	$ 6,462	$ 6,155
Loans:
Loans individually evaluated for impairment	19,905		20,169
Loans collectively evaluated for impairment	572,994		574,599
Total ending loans balance	592,899		594,768
Residential Portfolio Segment [Member]
Ending allowance balance attributable to loans:
Collectively evaluated for impairment	1,230		1,426
Total ending allowance balance	1,230	1,465	1,426	1,878	1,437	1,169
Loans:
Loans individually evaluated for impairment	1,902		1,415
Loans collectively evaluated for impairment	223,021		222,213
Total ending loans balance	224,923		223,628
Commercial Real Estate Portfolio Segment [Member]
Ending allowance balance attributable to loans:
Individually evaluated for impairment	1,168		2,506
Collectively evaluated for impairment	1,627		1,689
Total ending allowance balance	2,795	4,210	4,195	3,276	2,845	2,914
Loans:
Loans individually evaluated for impairment	10,275		11,711
Loans collectively evaluated for impairment	163,747		165,901
Total ending loans balance	174,022		177,612
Commercial Portfolio Segment [Member]
Ending allowance balance attributable to loans:
Individually evaluated for impairment	1,522		900
Collectively evaluated for impairment	765		702
Total ending allowance balance	2,287	1,738	1,602	1,625	1,331	1,279
Loans:
Loans individually evaluated for impairment	7,510		6,824
Loans collectively evaluated for impairment	78,063		77,174
Total ending loans balance	85,573		83,998
Consumer Portfolio Segment [Member]
Ending allowance balance attributable to loans:
Individually evaluated for impairment	4		6
Collectively evaluated for impairment	1,128		1,105
Total ending allowance balance	1,132	$ 907	1,111	$ 1,149	$ 849	$ 793
Loans:
Loans individually evaluated for impairment	218		219
Loans collectively evaluated for impairment	108,163		109,311
Total ending loans balance	$ 108,381		$ 109,530

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A valuation allowance for financing receivables that are expected to be uncollectible.

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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