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Note 3 - Intangible Assets and Goodwill (Details) - The Company’s Total Intangible Assets Consist of the Following (USD $)
In Thousands, unless otherwise specified
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9 Months Ended |
|
|
Jan. 31, 2014
|
Apr. 30, 2013
|
| Finite-Lived Intangible Assets [Line Items] |
|
|
| Gross Carrying Amount |
$ 2,897 |
$ 2,897 |
| Accumulated Amortization |
(1,363) |
(1,212) |
|
Patents, Trademarks and Copyrights [Member]
|
|
|
| Finite-Lived Intangible Assets [Line Items] |
|
|
| Gross Carrying Amount |
852 |
852 |
| Accumulated Amortization |
(456) |
(404) |
|
Customer Relationships [Member]
|
|
|
| Finite-Lived Intangible Assets [Line Items] |
|
|
| Gross Carrying Amount |
1,040 |
1,040 |
| Accumulated Amortization |
(496) |
(449) |
|
Trade Names [Member]
|
|
|
| Finite-Lived Intangible Assets [Line Items] |
|
|
| Estimated Useful Lives |
15 years |
|
| Gross Carrying Amount |
530 |
530 |
| Accumulated Amortization |
(227) |
(200) |
|
Developed Technology Rights [Member]
|
|
|
| Finite-Lived Intangible Assets [Line Items] |
|
|
| Gross Carrying Amount |
475 |
475 |
| Accumulated Amortization |
$ (184) |
$ (159) |
|
Minimum [Member] | Patents, Trademarks and Copyrights [Member]
|
|
|
| Finite-Lived Intangible Assets [Line Items] |
|
|
| Estimated Useful Lives |
10 years |
|
|
Minimum [Member] | Customer Relationships [Member]
|
|
|
| Finite-Lived Intangible Assets [Line Items] |
|
|
| Estimated Useful Lives |
5 years |
|
|
Minimum [Member] | Developed Technology Rights [Member]
|
|
|
| Finite-Lived Intangible Assets [Line Items] |
|
|
| Estimated Useful Lives |
13 years |
|
|
Minimum [Member]
|
|
|
| Finite-Lived Intangible Assets [Line Items] |
|
|
| Estimated Useful Lives |
5 years |
|
|
Maximum [Member] | Patents, Trademarks and Copyrights [Member]
|
|
|
| Finite-Lived Intangible Assets [Line Items] |
|
|
| Estimated Useful Lives |
15 years |
|
|
Maximum [Member] | Customer Relationships [Member]
|
|
|
| Finite-Lived Intangible Assets [Line Items] |
|
|
| Estimated Useful Lives |
15 years |
|
|
Maximum [Member] | Developed Technology Rights [Member]
|
|
|
| Finite-Lived Intangible Assets [Line Items] |
|
|
| Estimated Useful Lives |
15 years |
|
|
Maximum [Member]
|
|
|
| Finite-Lived Intangible Assets [Line Items] |
|
|
| Estimated Useful Lives |
15 years |
|