Note 4 - Loans and Allowance for Loan Losses - Loan Portfolio by Credit Quality (Details) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Rating:
Loans receivable	$ 615,314,674	$ 544,398,300
Residential Portfolio Segment [Member] | Construction Loans [Member]
Rating:
Loans receivable	56,812,066	40,912,307
Residential Portfolio Segment [Member] | One To Four Family Units [Member]
Rating:
Loans receivable	106,372,711	106,410,559
Residential Portfolio Segment [Member] | Multi Family Units [Member]
Rating:
Loans receivable	76,025,304	48,483,523
Commercial Real Estate Portfolio Segment [Member]
Rating:
Loans receivable	263,215,296	249,580,873
Commercial Portfolio Segment [Member]
Rating:
Loans receivable	87,030,844	75,404,732
Consumer Portfolio Segment [Member] | Other Loans [Member]
Rating:
Loans receivable	25,858,453	23,606,306
Pass [Member]
Rating:
Loans receivable	592,607,000	518,988,000
Pass [Member] | Residential Portfolio Segment [Member] | Construction Loans [Member]
Rating:
Loans receivable	51,447,000	35,465,000
Pass [Member] | Residential Portfolio Segment [Member] | One To Four Family Units [Member]
Rating:
Loans receivable	100,349,000	100,367,000
Pass [Member] | Residential Portfolio Segment [Member] | Multi Family Units [Member]
Rating:
Loans receivable	76,025,000	48,483,000
Pass [Member] | Commercial Real Estate Portfolio Segment [Member]
Rating:
Loans receivable	255,457,000	242,200,000
Pass [Member] | Commercial Portfolio Segment [Member]
Rating:
Loans receivable	83,654,000	69,093,000
Pass [Member] | Consumer Portfolio Segment [Member] | Other Loans [Member]
Rating:
Loans receivable	25,675,000	23,380,000
Special Mention [Member]
Rating:
Loans receivable	10,434,000	13,016,000
Special Mention [Member] | Residential Portfolio Segment [Member] | Construction Loans [Member]
Rating:
Loans receivable	0	0
Special Mention [Member] | Residential Portfolio Segment [Member] | One To Four Family Units [Member]
Rating:
Loans receivable	2,803,000	2,591,000
Special Mention [Member] | Residential Portfolio Segment [Member] | Multi Family Units [Member]
Rating:
Loans receivable	0	0
Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member]
Rating:
Loans receivable	5,916,000	5,922,000
Special Mention [Member] | Commercial Portfolio Segment [Member]
Rating:
Loans receivable	1,715,000	4,503,000
Special Mention [Member] | Consumer Portfolio Segment [Member] | Other Loans [Member]
Rating:
Loans receivable	0	0
Substandard [Member]
Rating:
Loans receivable	11,400,000	11,810,000
Substandard [Member] | Residential Portfolio Segment [Member] | Construction Loans [Member]
Rating:
Loans receivable	5,365,000	5,447,000
Substandard [Member] | Residential Portfolio Segment [Member] | One To Four Family Units [Member]
Rating:
Loans receivable	3,221,000	3,453,000
Substandard [Member] | Residential Portfolio Segment [Member] | Multi Family Units [Member]
Rating:
Loans receivable	0	0
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member]
Rating:
Loans receivable	1,676,000	1,459,000
Substandard [Member] | Commercial Portfolio Segment [Member]
Rating:
Loans receivable	954,000	1,225,000
Substandard [Member] | Consumer Portfolio Segment [Member] | Other Loans [Member]
Rating:
Loans receivable	184,000	226,000
Doubtful [Member]
Rating:
Loans receivable	874,000	584,000
Doubtful [Member] | Residential Portfolio Segment [Member] | Construction Loans [Member]
Rating:
Loans receivable	0	0
Doubtful [Member] | Residential Portfolio Segment [Member] | One To Four Family Units [Member]
Rating:
Loans receivable	0	0
Doubtful [Member] | Residential Portfolio Segment [Member] | Multi Family Units [Member]
Rating:
Loans receivable	0	0
Doubtful [Member] | Commercial Real Estate Portfolio Segment [Member]
Rating:
Loans receivable	166,000	0
Doubtful [Member] | Commercial Portfolio Segment [Member]
Rating:
Loans receivable	708,000	584,000
Doubtful [Member] | Consumer Portfolio Segment [Member] | Other Loans [Member]
Rating:
Loans receivable	$ 0	$ 0