Note 7 -Gross Realized Losses on Equity and Debt Securities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]
Gross realized gains	$ 316	$ 83	$ 915	$ 867
Gross realized losses	0	0	(73)	(67)
Other-than-temporary impairment losses	0	0	(192)
Net gain on investment securities	316	83	650	800
Equity Securities [Member]
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]
Gross realized gains	316	83	734	713
Gross realized losses	0	0		(23)
Other-than-temporary impairment losses	0	0	(192)
Net gain on investment securities	316	83	542	690
Debt Securities [Member]
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]
Gross realized gains	0	0	181	154
Gross realized losses	0	0	(73)	(44)
Other-than-temporary impairment losses	0	0
Net gain on investment securities	$ 0	$ 0	$ 108	$ 110