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Note 12 - Pension and Other Postretirement Benefit Plans (Details) - Assumptions Used to Develop Periodic Postretirement Expense for the Postretirement Plans
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Assumptions Used to Develop Periodic Postretirement Expense for the Postretirement Plans [Abstract]      
Rate of return on plan assets
Discount rate 3.76% 4.60% 3.75%
Rate of increase in health care costs      
Initial 8.00% 9.00% 10.00%
Ultimate (year 2018) 5.00% 5.00% 5.00%
Annual rate of salary increase for life insurance