Note 4 - Loans and Allowance for Loan Losses - Troubled Debt Restructurings (Details)	3 Months Ended
Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Number of loans	1
Pre-modification outstanding recorded balance	$ 119,459
Post-modification outstanding recorded balance	119,459
TDRs, carrying balance	$ 12,690,711	$ 13,149,615
Residential Portfolio Segment [Member] \| Real Estate Residential, One To Four Family Units [Member]
Number of loans	0
Pre-modification outstanding recorded balance	$ 0
Post-modification outstanding recorded balance	0
TDRs, carrying balance	$ 1,313,598	1,564,468
Residential Portfolio Segment [Member] \| Real Estate Residential, Multi Family Units [Member]
Number of loans	0
Pre-modification outstanding recorded balance	$ 0
Post-modification outstanding recorded balance	0
TDRs, carrying balance
Real Estate, Construction [Member]
Number of loans	0
Pre-modification outstanding recorded balance	$ 0
Post-modification outstanding recorded balance	0
TDRs, carrying balance	$ 5,309,728	5,446,895
Commercial Real Estate Portfolio Segment [Member]
Number of loans	0
Pre-modification outstanding recorded balance	$ 0
Post-modification outstanding recorded balance	0
TDRs, carrying balance	$ 5,701,518	5,736,849
Commercial Portfolio Segment [Member]
Number of loans	0
Pre-modification outstanding recorded balance	$ 0
Post-modification outstanding recorded balance	0
TDRs, carrying balance	$ 246,150	401,403
Consumer and Other Loans [Member]
Number of loans	1
Pre-modification outstanding recorded balance	$ 119,459
Post-modification outstanding recorded balance	119,459
TDRs, carrying balance	$ 119,717

Number of financing receivables that have been modified by troubled debt restructurings.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554

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