Note 8 - Long-term Debt (Details) - Credit Facility, Unused Fee Schedule (USD $)	12 Months Ended
	Dec. 31, 2013
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%