This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
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Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

+ References

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-Publisher FASB
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-SubTopic 10
-Section 50
-Paragraph 6
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The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 230
-SubTopic 10
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The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-SubTopic 10
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The price per share of the conversion feature embedded in the debt instrument.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
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The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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Cash received on stock transaction after deduction of issuance costs.

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No definition available.

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Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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No definition available.

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Price of a single share of a number of saleable stocks of a company.

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Investments - Equity Securities (Details) SEK / shares in Units, SEK in Millions			3 Months Ended	9 Months Ended
	Aug. 31, 2015 USD ($)	Aug. 11, 2014 SEK SEK / shares shares	Aug. 01, 2015 USD ($)	Jan. 30, 2016 USD ($)	Jan. 28, 2017 item	Apr. 30, 2016 item	Aug. 31, 2015 SEK / shares	Apr. 30, 2015 item
Equity Securities
Shares received on conversion \| shares		1,062,699
Impairment of available-for-sale securities				$ 2,186,000
CybAero \| Private Placement
Equity Securities
Share price (in SEK per share) \| SEK / shares							SEK 12.00
Proceeds received from sale of stock	$ 777,000
Realized gains on sale of shares	$ 207,000
CybAero \| Other Expense
Equity Securities
Impairment of available-for-sale securities			$ 2,186,000
Convertible bonds \| CybAero \| Exercise of conversion right on convertible debt securities
Equity Securities
Face amount converted \| SEK		SEK 10
Conversion price (in SEK per share) \| SEK / shares		SEK 9.41
Fair value of shares (in SEK per share) \| SEK / shares		SEK 37.50
Auction rate securities
Equity Securities
Number of available-for-sale securities \| item					2	2
Available-for-sale securities \| Common Stock \| CybAero
Equity Securities
Number of available-for-sale securities \| item								618,042