Note 7 - Long-Term Debt (Details) - Credit Facility, Unused Fee Schedule (USD $)	6 Months Ended
	Jun. 30, 2014
Minimum [Member]
Line of Credit Facility [Line Items]
Average Used Portion of the Revolver plus Outstanding Letters of Credit	$ 60,000,000
Applicable Unused Revolver Fee Margin	0.375%
Maximum [Member]
Line of Credit Facility [Line Items]
Average Used Portion of the Revolver plus Outstanding Letters of Credit	$ 60,000,000
Applicable Unused Revolver Fee Margin	0.50%