Note 4 - Loans and Allowance for Loan Losses (Details) - Risk Category of Commercial Loans by Class of Loans - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	$ 259,595	$ 261,610
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	233,741	236,482
Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	5,930	4,724
Classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	19,924	20,404
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	76,081	78,848
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	69,108	72,232
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] | Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	3,227	2,102
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] | Classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	3,746	4,514
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	73,296	71,229
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	63,993	60,491
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member] | Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	2,064	2,127
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member] | Classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	7,239	8,611
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	24,645	27,535
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	23,713	27,364
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	932	171
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	85,573	83,998
Commercial Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	76,927	76,395
Commercial Portfolio Segment [Member] | Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	639	495
Commercial Portfolio Segment [Member] | Classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	$ 8,007	$ 7,108