Note 4 - Loans and Allowance for Loan Losses - Loan Portfolio By Credit Quality (Details) - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Pass [Member] | Residential Portfolio Segment [Member] | Construction Loans [Member]
Rating:
Loans receivable	$ 33,769,000	$ 37,383,000
Pass [Member] | Residential Portfolio Segment [Member] | One To Four Family Units [Member]
Rating:
Loans receivable	103,048,000	91,267,000
Pass [Member] | Residential Portfolio Segment [Member] | Multi Family Units [Member]
Rating:
Loans receivable	38,192,000	41,604,000
Pass [Member] | Commercial Real Estate Portfolio Segment [Member]
Rating:
Loans receivable	230,410,000	198,230,000
Pass [Member] | Commercial Portfolio Segment [Member]
Rating:
Loans receivable	75,379,000	73,407,000
Pass [Member] | Consumer Portfolio Segment [Member] | Other Loans [Member]
Rating:
Loans receivable	22,991,000	21,775,000
Pass [Member]
Rating:
Loans receivable	503,789,000	463,666,000
Special Mention [Member] | Residential Portfolio Segment [Member] | Construction Loans [Member]
Rating:
Loans receivable
Special Mention [Member] | Residential Portfolio Segment [Member] | One To Four Family Units [Member]
Rating:
Loans receivable	2,802,000	3,319,000
Special Mention [Member] | Residential Portfolio Segment [Member] | Multi Family Units [Member]
Rating:
Loans receivable
Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member]
Rating:
Loans receivable	5,924,000	3,657,000
Special Mention [Member] | Commercial Portfolio Segment [Member]
Rating:
Loans receivable	4,544,000	2,267,000
Special Mention [Member] | Consumer Portfolio Segment [Member] | Other Loans [Member]
Rating:
Loans receivable
Special Mention [Member]
Rating:
Loans receivable	13,270,000	9,243,000
Substandard [Member] | Residential Portfolio Segment [Member] | Construction Loans [Member]
Rating:
Loans receivable	7,537,000	8,080,000
Substandard [Member] | Residential Portfolio Segment [Member] | One To Four Family Units [Member]
Rating:
Loans receivable	3,542,000	3,671,000
Substandard [Member] | Residential Portfolio Segment [Member] | Multi Family Units [Member]
Rating:
Loans receivable
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member]
Rating:
Loans receivable	2,388,000	6,937,000
Substandard [Member] | Commercial Portfolio Segment [Member]
Rating:
Loans receivable	1,213,000	4,730,000
Substandard [Member] | Consumer Portfolio Segment [Member] | Other Loans [Member]
Rating:
Loans receivable	271,000	217,000
Substandard [Member]
Rating:
Loans receivable	14,951,000	23,635,000
Doubtful [Member] | Residential Portfolio Segment [Member] | Construction Loans [Member]
Rating:
Loans receivable
Doubtful [Member] | Residential Portfolio Segment [Member] | One To Four Family Units [Member]
Rating:
Loans receivable
Doubtful [Member] | Residential Portfolio Segment [Member] | Multi Family Units [Member]
Rating:
Loans receivable
Doubtful [Member] | Commercial Real Estate Portfolio Segment [Member]
Rating:
Loans receivable
Doubtful [Member] | Commercial Portfolio Segment [Member]
Rating:
Loans receivable	603,000	603,000
Doubtful [Member] | Consumer Portfolio Segment [Member] | Other Loans [Member]
Rating:
Loans receivable
Doubtful [Member]
Rating:
Loans receivable	603,000	603,000
Residential Portfolio Segment [Member] | Construction Loans [Member]
Rating:
Loans receivable	41,305,779	45,462,895
Residential Portfolio Segment [Member] | One To Four Family Units [Member]
Rating:
Loans receivable	109,391,522	98,257,417
Residential Portfolio Segment [Member] | Multi Family Units [Member]
Rating:
Loans receivable	38,192,064	41,603,670
Commercial Real Estate Portfolio Segment [Member]
Rating:
Loans receivable	238,722,021	208,824,573
Commercial Portfolio Segment [Member]
Rating:
Loans receivable	81,739,377	81,006,897
Consumer Portfolio Segment [Member] | Other Loans [Member]
Rating:
Loans receivable	23,261,945	21,991,881
Loans receivable	$ 532,612,708	$ 497,147,333