Note 12 - Pension and Other Postretirement Benefit Plans (Details) - Assumptions Used to Develop Periodic Pension Benefit for the Retirement Plan	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Note 12 - Pension and Other Postretirement Benefit Plans (Details) - Assumptions Used to Develop Periodic Pension Benefit for the Retirement Plan [Line Items]
Weighted average discount rate	4.60%	3.75%	4.25%
Rate of increase in future compensation levels
Expected long-term rate of return on assets
Retirement Plan [Member]
Note 12 - Pension and Other Postretirement Benefit Plans (Details) - Assumptions Used to Develop Periodic Pension Benefit for the Retirement Plan [Line Items]
Weighted average discount rate	4.60%	3.75%	4.25%
Rate of increase in future compensation levels
Expected long-term rate of return on assets	7.50%	7.50%	7.50%