Note 12 - Pension and Other Postretirement Benefit Plans (Details) - For the Retirement Plan, the Change in Benefit Obligation and Assets (Retirement Plan [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Retirement Plan [Member]
Change in benefit obligation:
Projected benefit obligation, balance	$ 19,740	$ 22,531
Interest cost	891	827	879
Actuarial (gains) loss	4,446	(2,485)
Benefits paid	(980)	(1,133)
Projected benefit obligation, balance	24,097	19,740	22,531
Change in plan assets:
Market value of assets, balance	20,496	17,300
Actual return on plan assets	993	3,498
Employer contributions		831
Benefits paid	(980)	(1,133)
Market value of assets, balance	20,509	20,496	17,300
Accrued pension (liability) prepaid included in other (liabilities) assets	$ (3,588)	$ 756