Note 2 - Adoption of New Accounting Standards (Details) - Amounts Reclassified out of Accumulated Other Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Note 2 - Adoption of New Accounting Standards (Details) - Amounts Reclassified out of Accumulated Other Comprehensive Income [Line Items]
	$ (1,127)	$ (890)	$ (2,445)	$ (1,246)
Net of Tax	3,060	2,667	6,367	5,498
	4,674	4,037	9,784	7,702
	(1,127)	(890)	(2,445)	(1,246)
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Note 2 - Adoption of New Accounting Standards (Details) - Amounts Reclassified out of Accumulated Other Comprehensive Income [Line Items]
Unrealized gains and losses on available for sale investment securities	62		51
	(22)		(18)
Net of Tax	40		33
	(22)		(18)
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Note 2 - Adoption of New Accounting Standards (Details) - Amounts Reclassified out of Accumulated Other Comprehensive Income [Line Items]
	23		46
Net of Tax	(44)		(88)
Prior service costs	(64)		(128)
Actuarial losses	(3)		(6)
	(67)		(134)
	23		46
Reclassification out of Accumulated Other Comprehensive Income [Member]
Note 2 - Adoption of New Accounting Standards (Details) - Amounts Reclassified out of Accumulated Other Comprehensive Income [Line Items]
Net of Tax	$ (4)		$ (55)