Note 12 - Pension and Other Postretirement Benefit Plans (Details) - Employee Benefit Trust (EBT) Shares (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Employee Benefit Trust (EBT) Shares [Abstract]
Shares owned by Employee Benefit Trust, balance	913,792	1,028,565
Market value of unallocated shares. (in Dollars)	$ 16,235,257	$ 18,915,494
Shares purchased	23,717	29,168
Shares released and allocated	(136,559)	(143,941)
Shares owned by Employee Benefit Trust, balance	800,950	913,792