Note 4 - Retirement Plans (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Note 4 - Retirement Plans (Details) [Line Items]
Defined Benefit Plan, Contributions by Employer	$ 3.7
Minimum [Member]
Note 4 - Retirement Plans (Details) [Line Items]
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year	1.7
Maximum [Member]
Note 4 - Retirement Plans (Details) [Line Items]
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year	$ 4.3