|
Note 8 - Unrecognized Tax Benefits (Details) (USD $)
|
9 Months Ended | ||
|---|---|---|---|
|
Jan. 31, 2014
|
Jan. 31, 2013
|
Apr. 30, 2013
|
|
| Note 8 - Unrecognized Tax Benefits (Details) [Line Items] | |||
| Unrecognized Tax Benefits | $ 11,787,000 | $ 8,938,000 | |
| Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 7,662,000 | ||
| Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | 432,000 | 286 | |
| Income Tax Examination, Penalties and Interest Expense | 146 | 141 | |
| Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Lower Bound | $ 1,518 | ||
|
2010 and Forward (Member)
|
|||
| Note 8 - Unrecognized Tax Benefits (Details) [Line Items] | |||
| Statute of Limitations for Federal Tax Years Open | 2010 and forward | ||
|
2009 and Forward [Member]
|
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| Note 8 - Unrecognized Tax Benefits (Details) [Line Items] | |||
| Statute of Limitations for Federal Tax Years Open | 2009 and forward | ||