Note 9 - Long-Term Debt (Detail) - Long-term Debt (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Revolving Credit Facility, interest payable monthly	Variable, 0.9%
Revolving Credit Facility, interest payable monthly	2013
Revolving Credit Facility, interest payable monthly	$ 0	$ 0
Unsecured term note payable to National, interest payable quarterly, principal payable at maturity	Variable, 2.8%
Unsecured term note payable to National, interest payable quarterly, principal payable at maturity	2018
Unsecured term note payable to National, interest payable quarterly, principal payable at maturity	10,000	10,000
	10,000	10,000
Less current portion	0	0
	$ 10,000	$ 10,000