Note 4 - Risk Category of Commercial Loans by Class of Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member]
Loans receivable	$ 61,875	$ 62,287
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member]
Loans receivable	74,319	61,577
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans receivable	29,554	23,080
Pass [Member] | Commercial and Industrial Portfolio Segment [Member]
Loans receivable	79,906	70,852
Pass [Member] | Commercial Portfolio Segment [Member]
Loans receivable	245,654	217,796
Criticized [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member]
Loans receivable	369	6,738
Criticized [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member]
Loans receivable	1,717	6,305
Criticized [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans receivable
Criticized [Member] | Commercial and Industrial Portfolio Segment [Member]
Loans receivable		5,232
Criticized [Member] | Commercial Portfolio Segment [Member]
Loans receivable	2,086	18,275
Classified [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member]
Loans receivable	8,234	4,433
Classified [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member]
Loans receivable	7,623	4,120
Classified [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans receivable	545	772
Classified [Member] | Commercial and Industrial Portfolio Segment [Member]
Loans receivable	3,459	5,852
Classified [Member] | Commercial Portfolio Segment [Member]
Loans receivable	19,861	15,177
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member]
Loans receivable	70,478	73,458
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member]
Loans receivable	83,659	72,002
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans receivable	30,099	23,852
Commercial Real Estate Portfolio Segment [Member]
Loans receivable	184,236	169,312
Commercial and Industrial Portfolio Segment [Member]
Loans receivable	83,365	81,936
Commercial Portfolio Segment [Member]
Loans receivable	267,601	251,248
Loans receivable	$ 602,936	$ 585,752