Note 4 - Loans - Secured Loans by Property Type of the Collateral (Detail) $ in Thousands		9 Months Ended	12 Months Ended
		Sep. 30, 2016 USD ($) MortgageLoan	Dec. 31, 2015 USD ($) MortgageLoan	Sep. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Loans Details - Secured Loans by Property Type of the Collateral [Line Items]
Number of loans | MortgageLoan		57	53
Loans - principal (in Dollars) | $		$ 83,385	$ 62,740	$ 46,721	$ 71,017
Loans - percent		100.00%	100.00%
Single Family [Member]
Loans Details - Secured Loans by Property Type of the Collateral [Line Items]
Number of loans | MortgageLoan	[1]	35	33
Loans - principal (in Dollars) | $	[1]	$ 29,479	$ 27,673
Loans - percent	[1]	35.00%	45.00%
Multi-family [Member]
Loans Details - Secured Loans by Property Type of the Collateral [Line Items]
Number of loans | MortgageLoan		2	1
Loans - principal (in Dollars) | $		$ 893	$ 584
Loans - percent		1.00%	1.00%
Commercial [Member]
Loans Details - Secured Loans by Property Type of the Collateral [Line Items]
Number of loans | MortgageLoan		19	18
Loans - principal (in Dollars) | $		$ 52,563	$ 34,033
Loans - percent		63.00%	53.00%
Land [Member]
Loans Details - Secured Loans by Property Type of the Collateral [Line Items]
Number of loans | MortgageLoan		1	1
Loans - principal (in Dollars) | $		$ 450	$ 450
Loans - percent		1.00%	1.00%

[1] Single family properties include owner-occupied and non-owner occupied 1-4 unit residential buildings, condominium units, townhouses, and condominium complexes. The single family property type as of September 30, 2016 consists of 17 loans with principal of approximately $12,221,000 that are owner occupied and 18 loans with principal of approximately $17,258,000 that are non-owner occupied. At December 31, 2015, single family property consisted of 15 loans with principal of approximately $14,157,000 that were owner occupied and 18 loans with principal of approximately $13,516,000 that were non-owner occupied.