Note 4 - Loans - Secured Loans by Property Type of the Collateral (Parenthetical) (Detail)	6 Months Ended	12 Months Ended
	Jun. 30, 2016 USD ($) MortgageLoan	Dec. 31, 2015 USD ($) MortgageLoan	Jun. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Loans Details [Line Items]
Mortgage Loans on Real Estate, Number of Loans | MortgageLoan	56	53
Loans - principal (in Dollars) | $	$ 90,531,000	$ 62,740,000	$ 71,353,000	$ 71,017,000
Single Family Property-Owner Occupied [Member]
Loans Details [Line Items]
Mortgage Loans on Real Estate, Number of Loans | MortgageLoan	15	15
Loans - principal (in Dollars) | $	$ 12,358,000	$ 14,157,000
Single Family Property-NonOwner Occupied [Member]
Loans Details [Line Items]
Mortgage Loans on Real Estate, Number of Loans | MortgageLoan	22	18
Loans - principal (in Dollars) | $	$ 27,485,000	$ 13,516,000