Note 6 - Loans Held for Investment (Details) - Consumer Credit Exposure by Assigned Risk Grade (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Consumer Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Consumer credit exposure by internally assigned grade	$ 16,996	$ 17,796
Consumer Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Consumer credit exposure by internally assigned grade	598	636
Consumer Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Consumer credit exposure by internally assigned grade	511	431
Consumer Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Consumer credit exposure by internally assigned grade	18,105	18,863
Consumer Construction [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Consumer credit exposure by internally assigned grade	1,583	1,412
Consumer Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Consumer credit exposure by internally assigned grade	1,583	1,412
Consumer Lots and Raw Land [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Consumer credit exposure by internally assigned grade	10,016	9,958
Consumer Lots and Raw Land [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Consumer credit exposure by internally assigned grade	285	288
Consumer Lots and Raw Land [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Consumer credit exposure by internally assigned grade	133	184
Consumer Lots and Raw Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Consumer credit exposure by internally assigned grade	10,434	10,430
Home Equity Lines of Credit [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Consumer credit exposure by internally assigned grade	26,940	27,828
Home Equity Lines of Credit [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Consumer credit exposure by internally assigned grade	58	60
Home Equity Lines of Credit [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Consumer credit exposure by internally assigned grade	144	171
Home Equity Lines of Credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Consumer credit exposure by internally assigned grade	27,142	28,059
Consumer Unsecured [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Consumer credit exposure by internally assigned grade	5,319	3,866
Consumer Unsecured [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Consumer credit exposure by internally assigned grade	3	4
Consumer Unsecured [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Consumer credit exposure by internally assigned grade	59	62
Consumer Unsecured [Member]
Financing Receivable, Recorded Investment [Line Items]
Consumer credit exposure by internally assigned grade	$ 5,381	$ 3,932