|
Note 10 - Commitments and Contingencies (Detail) (USD $)
|
1 Months Ended | 3 Months Ended | 3 Months Ended | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Apr. 26, 2011
|
Apr. 30, 2013
|
Jun. 01, 2013
|
Feb. 29, 2012
|
Sep. 02, 2011
|
May 13, 2011
|
Apr. 30, 2013
Previous Ownership Percentage (Member)
|
Apr. 30, 2013
New Ownership Percentage (Member)
|
Apr. 16, 2013
Additional Damages Sought [Member]
|
Jan. 31, 2013
Legal Fees (Member)
|
Jan. 31, 2013
Possible Liability from Losing Lawsuit (Member)
|
Apr. 30, 2010
Letter of Credit [Member]
|
Apr. 30, 2013
Minimum [Member]
|
Apr. 30, 2013
Maximum [Member]
|
|
| Issue Purchase Orders to Suppliers with Delivery Dates | 28 days | 42 days | ||||||||||||
| Forecasts of Material and Finished Goods Requirements Rolling Period | 6 months | |||||||||||||
| Recorded Unconditional Purchase Obligation | $ 1,100,000 | |||||||||||||
| Sale of Stock, Number of Shares Issued in Transaction (in Shares) | 6,250,000 | |||||||||||||
| Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 9.00% | 49.00% | ||||||||||||
| Letters of Credit Outstanding, Amount | 77,000 | |||||||||||||
| Loss Contingency, Damages Sought, Value | 1,200,000 | |||||||||||||
| Loss Contingency Amount Claimed for Recovery of Damages | 4,900,000 | |||||||||||||
| Gain Contingency, Unrecorded Amount | 15,000,000 | |||||||||||||
| Previously Accrued Seeking Payments | $ 400,000 | $ 1,100,000 | ||||||||||||
| Number of Patents Relating to Power Technology | 5 | |||||||||||||
| Number of Comaro Patents | 5 | |||||||||||||