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Note 8 - Segment Reporting (Details) - Segment Reporting (USD $)
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3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
|
Jan. 31, 2014
|
Jan. 31, 2013
|
Jan. 31, 2014
|
Jan. 31, 2013
|
Apr. 30, 2013
|
|
| Segment Reporting Information [Line Items] | |||||
| Total revenues | $ 7,683,000 | $ 7,458,000 | $ 21,787,000 | $ 17,853,000 | |
| Gross margin | 2,922,000 | 2,803,000 | 8,158,000 | 6,603,000 | |
| Goodwill | 1,942,000 | 1,942,000 | 1,942,000 | 1,942,000 | 1,942,000 |
|
Original Equipment Manufactures [Member]
|
|||||
| Segment Reporting Information [Line Items] | |||||
| Total revenues | 3,032,000 | 4,424,000 | 10,930,000 | 9,968,000 | |
| Gross margin | 698,000 | 1,226,000 | 2,772,000 | 2,574,000 | |
| Goodwill | 0 | 0 | 0 | 0 | |
|
Proprietary Products [Member]
|
|||||
| Segment Reporting Information [Line Items] | |||||
| Total revenues | 4,651,000 | 3,034,000 | 10,857,000 | 7,885,000 | |
| Gross margin | 2,224,000 | 1,577,000 | 5,386,000 | 4,029,000 | |
| Goodwill | $ 1,942,000 | $ 1,942,000 | $ 1,942,000 | $ 1,942,000 | |