Note 6 - Comprehensive Income (Details) - Amounts Reclassified Out of Accumulated Other Comprehensive Income (USD $)	3 Months Ended				12 Months Ended	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Accumulated Net Unrealized Investment Gain (Loss) [Member] Reclassification out of Accumulated Other Comprehensive Income [Member]	Mar. 31, 2014 Accumulated Net Unrealized Investment Gain (Loss) [Member]	Dec. 31, 2013 Accumulated Net Unrealized Investment Gain (Loss) [Member]	Mar. 31, 2014 Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Unrealized net holding gains on available-for-sale securities			$ 622
Tax effect	697,000	733,000		(849,000)	(1,758,000)	(212)
Accumulated other comprehensive income, net of tax	$ 2,296,000	$ 2,408,000				$ 410