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Note 9 - Benefit Plans (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Apr. 30, 2012
Note 9 - Benefit Plans (Details) [Line Items]      
Defined Contribution Plan, Employer Discretionary Contribution Amount $ 5,348 $ 4,949 $ 3,681
Common Stock, Capital Shares Reserved for Future Issuance (in Shares) 1,488,510 1,496,465  
Deferred Compensation Liability, Current 5,925 6,457  
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 4.40% 4.00%  
Pension and Other Postretirement Benefit Expense 93 471 662
Expected Retirement Benefit Expense For Next Five Years 625    
Other Postretirement Benefit Plan, Defined Benefit [Member]
      
Note 9 - Benefit Plans (Details) [Line Items]      
Deferred Compensation Liability, Current and Noncurrent 3,950 4,016  
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months 167    
Defined Benefit Plan, Expected Future Benefit Payments, Year Two 497    
Defined Benefit Plan, Expected Future Benefit Payments, Year Three 497    
Defined Benefit Plan, Expected Future Benefit Payments, Year Four 497    
Defined Benefit Plan, Expected Future Benefit Payments, Year Five 441    
Deferred Compensation Arrangement with Individual, Compensation Expense $ 156 $ 438 $ 563