Note 4 - Earnings Per Common Share (Details) - Components Used in Computation of Basic and Diluted Earnings Per Common Share (Parentheticals) (1.25% Convertible Senior Notes Due August 2032 [Member])	Mar. 31, 2014	Mar. 31, 2013
1.25% Convertible Senior Notes Due August 2032 [Member]
Note 4 - Earnings Per Common Share (Details) - Components Used in Computation of Basic and Diluted Earnings Per Common Share (Parentheticals) [Line Items]
Convertible senior notes, interest percentage	1.25%	1.25%