Note 4 - Troubled Debt Restructurings - Summary of Troubled Debt Restructurings (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Residential Portfolio Segment [Member] | One-to-Four Family Loans [Member] | Accrual Status [Member]
Troubled debt restructuring
Residential Portfolio Segment [Member] | One-to-Four Family Loans [Member] | Non-Accrual Status [Member]
Troubled debt restructuring
Residential Portfolio Segment [Member] | One-to-Four Family Loans [Member]
Troubled debt restructuring
Commercial Real Estate Portfolio Segment [Member] | Accrual Status [Member]
Troubled debt restructuring
Commercial Real Estate Portfolio Segment [Member] | Non-Accrual Status [Member]
Troubled debt restructuring
Commercial Real Estate Portfolio Segment [Member]
Troubled debt restructuring
Real Estate Construction Portfolio Segment [Member] | Accrual Status [Member]
Troubled debt restructuring
Real Estate Construction Portfolio Segment [Member] | Non-Accrual Status [Member]
Troubled debt restructuring
Real Estate Construction Portfolio Segment [Member]
Troubled debt restructuring
Home Equity Portfolio Segment [Member] | Accrual Status [Member]
Troubled debt restructuring	44	46
Home Equity Portfolio Segment [Member] | Non-Accrual Status [Member]
Troubled debt restructuring
Home Equity Portfolio Segment [Member]
Troubled debt restructuring	44	46
Consumer Portfolio Segment [Member] | Accrual Status [Member]
Troubled debt restructuring
Consumer Portfolio Segment [Member] | Non-Accrual Status [Member]
Troubled debt restructuring
Consumer Portfolio Segment [Member]
Troubled debt restructuring
Commercial Portfolio Segment [Member] | Accrual Status [Member]
Troubled debt restructuring
Commercial Portfolio Segment [Member] | Non-Accrual Status [Member]
Troubled debt restructuring
Commercial Portfolio Segment [Member]
Troubled debt restructuring
Accrual Status [Member]
Troubled debt restructuring	44	46
Non-Accrual Status [Member]
Troubled debt restructuring
Troubled debt restructuring	$ 44	$ 46