Note 4 - Long-Term Debt (Detail) - Components of Long-Term Debt (Parentheticals)	Mar. 31, 2013	Dec. 31, 2012
Due March 2017 [Member]
Interest Rate	4.25%	4.25%
Notes Payable	1.50%	1.50%
Due July 2016 [Member]
Interest Rate	4.65%	4.65%
Due October 2015 [Member]
Interest Rate	4.95%	4.95%
Due March 2015 [Member]
Interest Rate	6.28%	6.28%
Due August 2014 [Member]
Interest Rate	6.26%	6.26%