Note 11 - Long-term Debt (Detail) - Credit Facility, Unused Fee Schedule (USD $)	3 Months Ended
	Mar. 31, 2013
Level II [Member] | Maximum [Member] | Revolver [Member]
Applicable Unused Revolver Fee Margin	0.50%
Level II [Member] | Maximum [Member]
Average Used Portion of the Revolver plus Outstanding Letters of Credit (in Dollars)	60,000,000
Level I [Member] | Minimum [Member] | Revolver [Member]
Applicable Unused Revolver Fee Margin	0.375%
Level I [Member] | Minimum [Member]
Average Used Portion of the Revolver plus Outstanding Letters of Credit (in Dollars)	60,000,000