Note 12 - Pension and Other Postretirement Benefit Plans (Details) - For the Postretirement Plans, the Change in Benefit Obligation and Assets (Postretirement Plans [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Postretirement Plans [Member]
Change in benefit obligation:
Projected benefit obligation, balance	$ 5,586	$ 5,927
Service cost	358	449	400
Interest cost	253	219	217
Actuarial loss (gain)	1,925	(943)
Benefits paid	(49)	(66)
Projected benefit obligation, balance	8,073	5,586	5,927
Change in plan assets:
Employer contributions	49	66
Benefits paid	(49)	(66)
Accrued pension cost included in other liabilities	$ (8,073)	$ (5,586)