Note 12 - Other Comprehensive Income (Loss) (Details) - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Unrealized gains (losses) on securities available-for-sale:
Realized loss on sale of available-for-sale securities	$ 0
OTTI impairment of equity security	(13,316,000)	$ (13,012,000)	$ (13,516,000)
Effect of income taxes	(16,933,000)	(15,281,000)	(11,228,000)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Unrealized gains (losses) on securities available-for-sale:
Realized loss on sale of available-for-sale securities		(9,000)	(5,000)
OTTI impairment of equity security	(103,000)
Effect of income taxes	36,000	3,000	2,000
Reclassifications, net of income taxes	$ (67,000)	$ (6,000)	$ (3,000)