Note 6 - Acquisitions (Tables)

9 Months Ended

Jan. 31, 2014

Business Combinations [Abstract]

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]

Assets acquired:
Inventories	$	1,409
Property and equipment		19,994
Total assets		21,403
Liabilities assumed:
Accrued expenses		110
Total liabilities		110
Net tangible assets acquired, net of cash		21,293
Goodwill and other intangible assets		5,290
Total consideration paid, net of cash acquired	$	26,583

Business Acquisition, Pro Forma Information [Table Text Block]

	Nine months ended January 31,
	2014		2013
Total revenues	$	5,950,914		5,535,896
Net earnings		112,267		89,006
Earnings per common share:
Basic	$	2.92		2.32
Diluted	$	2.89		2.31