|
Note 10 - Commitments and Contingencies (Details) (USD $)
|
0 Months Ended | 1 Months Ended | 6 Months Ended | 0 Months Ended | 0 Months Ended | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Mar. 10, 2014
|
Mar. 06, 2012
|
Apr. 26, 2011
|
Jul. 31, 2014
|
Apr. 30, 2014
|
Feb. 29, 2012
|
Sep. 02, 2011
|
May 13, 2011
|
Jul. 24, 2012
Cost of Sales [Member]
Product and Freight Costs (Member)
|
Apr. 30, 2010
Letter of Credit [Member]
|
Jul. 31, 2014
Previous Ownership Percentage [Member]
|
Jul. 31, 2014
New Ownership Percentage [Member]
|
Apr. 16, 2013
Additional Damages Sought [Member]
|
Feb. 04, 2014
Including Accrued Liabilities [Member]
Chicony Power Technology Company Ltd [Member]
|
Jun. 02, 2014
Chicony Power Technology Company Ltd [Member]
|
Jun. 02, 2014
Chicony Power Technology Company Ltd [Member]
|
May 30, 2014
Chicony Power Technology Company Ltd [Member]
|
May 15, 2014
Chicony Power Technology Company Ltd [Member]
|
May 16, 2014
Chicony Power Technology Company Ltd [Member]
|
Feb. 04, 2014
Chicony Power Technology Company Ltd [Member]
|
|
| Note 10 - Commitments and Contingencies (Details) [Line Items] | ||||||||||||||||||||
| 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 | |||||||||||||||||||
| Deferred Compensation Liability, Current and Noncurrent | 0 | |||||||||||||||||||
| Legal Contingency, Damage Seeking, Value | 17,000,000 | |||||||||||||||||||
| 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 | |||||||||||||||||||
| Litigation Settlement, Amount | 10,800,000 | 7,600,000 | 9,700,000 | |||||||||||||||||
| Previously Accrued Seeking Payments | 1,100,000 | |||||||||||||||||||
| Proceeds from Legal Settlements | 3,600,000 | 3,600,000 | 3,600,000 | 4,000,000 | ||||||||||||||||
| Former Gain Contingency, Recognized in Current Period | 7,600,000 | |||||||||||||||||||
| Number of Units under Indemnity Agreement | 500,000 | |||||||||||||||||||
| Number of Patents Relating to Power Technology | 5 | |||||||||||||||||||
| Number of Comaro Patents | 5 | |||||||||||||||||||
| Damages Sought In Lawsuit | 2,500,000 | |||||||||||||||||||
| Litigation Settlement, Noncash, Recovery of Previously Incurred Costs | $ 1,400,000 | |||||||||||||||||||