Note 6 - Fair Value - Assets and Liabilities Measured at Fair Value on a Non-recurring basis (Detail) - Fair Value, Measurements, Nonrecurring [Member] $ in Thousands	Sep. 30, 2016 USD ($)
Fair Value, Inputs, Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Impaired loans with specific allowance, net for which an adjustment was recorded in the year	$ 0
REO for which a valuation reserve has been recorded in the year	0
Fair Value, Inputs, Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Impaired loans with specific allowance, net for which an adjustment was recorded in the year	0
REO for which a valuation reserve has been recorded in the year	5,725
REO acquired through foreclosure during the year	416	[1]
Fair Value, Inputs, Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Impaired loans with specific allowance, net for which an adjustment was recorded in the year	0
REO for which a valuation reserve has been recorded in the year	0
Estimate of Fair Value Measurement [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Impaired loans with specific allowance, net for which an adjustment was recorded in the year	0
REO for which a valuation reserve has been recorded in the year	5,725
REO acquired through foreclosure during the year	$ 416	[1]

[1] The dollar amount presented is net of the fair value of the property at acquisition of the REO and the principal and interest owing on the first mortgage assumed of approximately $926,000. The mortgage was paid off in June 2016.