Note 4 - Loans and Allowance for Loan Losses - Loans by Aging (Details) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Loans receivable, past due	$ 12,272,000	$ 1,596,000
Loans receivable, current	603,043,000	542,802,000
Loans receivable	615,314,674	544,398,300
Loans receivable, past due and accruing
Residential Portfolio Segment [Member] | One To Four Family Units [Member]
Loans receivable, past due	1,768,000	965,000
Loans receivable, current	104,605,000	105,446,000
Loans receivable	106,372,711	106,410,559
Loans receivable, past due and accruing
Residential Portfolio Segment [Member] | Multi Family Units [Member]
Loans receivable, past due	351,000
Loans receivable, current	75,674,000	48,483,000
Loans receivable	76,025,304	48,483,523
Loans receivable, past due and accruing
Residential Portfolio Segment [Member] | Construction Loans [Member]
Loans receivable, past due	7,440,000
Loans receivable, current	49,372,000	40,912,000
Loans receivable	56,812,066	40,912,307
Loans receivable, past due and accruing
Commercial Real Estate Portfolio Segment [Member]
Loans receivable, past due	827,000
Loans receivable, current	262,388,000	249,581,000
Loans receivable	263,215,296	249,580,873
Loans receivable, past due and accruing
Commercial Portfolio Segment [Member]
Loans receivable, past due	1,879,000	593,000
Loans receivable, current	85,152,000	74,812,000
Loans receivable	87,030,844	75,404,732
Loans receivable, past due and accruing
Consumer Portfolio Segment [Member] | Other Loans [Member]
Loans receivable, past due	7,000	38,000
Loans receivable, current	25,852,000	23,568,000
Loans receivable	25,858,453	23,606,306
Loans receivable, past due and accruing
Financing Receivables, 30 to 59 Days Past Due [Member]
Loans receivable, past due	9,706,000	367,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Residential Portfolio Segment [Member] | One To Four Family Units [Member]
Loans receivable, past due	1,153,000	367,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Residential Portfolio Segment [Member] | Multi Family Units [Member]
Loans receivable, past due	351,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Residential Portfolio Segment [Member] | Construction Loans [Member]
Loans receivable, past due	7,440,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable, past due	161,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Loans receivable, past due	601,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Other Loans [Member]
Loans receivable, past due
Financing Receivables, 60 to 89 Days Past Due [Member]
Loans receivable, past due	422,000	495,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Residential Portfolio Segment [Member] | One To Four Family Units [Member]
Loans receivable, past due	422,000	495,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Residential Portfolio Segment [Member] | Multi Family Units [Member]
Loans receivable, past due
Financing Receivables, 60 to 89 Days Past Due [Member] | Residential Portfolio Segment [Member] | Construction Loans [Member]
Loans receivable, past due
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable, past due
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Loans receivable, past due
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Other Loans [Member]
Loans receivable, past due
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans receivable, past due	2,144,000	734,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Residential Portfolio Segment [Member] | One To Four Family Units [Member]
Loans receivable, past due	193,000	103,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Residential Portfolio Segment [Member] | Multi Family Units [Member]
Loans receivable, past due
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Residential Portfolio Segment [Member] | Construction Loans [Member]
Loans receivable, past due
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable, past due	666,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Loans receivable, past due	1,278,000	593,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Other Loans [Member]
Loans receivable, past due	$ 7,000	$ 38,000