Note 4 - Long-Term Debt (Detail) - Components of Long-Term Debt (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Notes Payable	$ 148,001	$ 150,852
Less current maturities	11,873	11,623
Long-term debt, net of current maturities	136,128	139,229
Due March 2017 [Member]
Notes Payable	122,089	122,376
Due July 2016 [Member]
Notes Payable	11,851	12,668
Due October 2015 [Member]
Notes Payable	4,680	5,102
Due March 2015 [Member]
Notes Payable	3,717	4,150
Due August 2014 [Member]
Notes Payable	$ 5,664	$ 6,556