Note 7 - Employee Benefit Plans (Details) - USD ($) $ in Millions	1 Months Ended	8 Months Ended	9 Months Ended
	Jan. 31, 2015	Sep. 30, 2015	Sep. 30, 2015
Pension Plan [Member]
Note 7 - Employee Benefit Plans (Details) [Line Items]
Defined Benefit Plan, Contributions by Employer	$ 5.0
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year		$ 0.0
Unfunded Supplemental Executive Retirement Plan [Member]
Note 7 - Employee Benefit Plans (Details) [Line Items]
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year			$ 0.4