Note 12 - Pension and Other Postretirement Benefit Plans (Details) - The Components of the Net Pension Expense for the Retirement Plan (Retirement Plan [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Retirement Plan [Member]
Note 12 - Pension and Other Postretirement Benefit Plans (Details) - The Components of the Net Pension Expense for the Retirement Plan [Line Items]
Interest cost	$ 891	$ 827	$ 879
Amortization of unrecognized loss	759	1,222	1,032
Expected return on plan assets	(1,344)	(1,261)	(1,257)
Net pension expense (benefit)	306	788	654
Current year actuarial (gain) loss	4,798	(4,722)	652
Amortization of actuarial loss	(759)	(1,222)	(1,032)
Total recognized in other comprehensive income	4,039	(5,944)	(380)
Total recognized in net pension cost (benefit) and other comprehensive income	$ 4,345	$ (5,156)	$ 274