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Subsequent Events (Details) (Subsequent Event [Member], Gemma Power Inc [Member], Moxie Liberty LLC [Member], USD $) | 1 Months Ended
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Aug. 31, 2013
Subsequent Event [Member] | Gemma Power Inc [Member] | Moxie Liberty LLC [Member] |
Subsequent Events (Textual) [Abstract] |
Cash received from Moxie Liberty in respect of sale of membership interest to third party investor | $ 19,373,000
Cash received from Moxie Liberty in respect of development success fees | 14,245,000
Cash received from Moxie Liberty for repayment of notes receivable and accrued interest | $ 5,128,000

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- Definition Proceeds from receipt of development success fees related to project. + References No definition available. + Details
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Namespace Prefix: | agx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Proceeds from repayment of notes receivable and accrued interest. + References No definition available. + Details
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Namespace Prefix: | agx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
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Namespace Prefix: | agx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate cash proceeds received from a combination of transactions in which noncurrent assets are sold, which may include the sale of a business, an investment in an affiliate (including an equity method investee), property, plant and equipment and intangible assets. Excludes sales of trading, available-for-sale, and held-to-maturity securities. + References No definition available. + Details
Name: | us-gaap_ProceedsFromSalesOfBusinessAffiliateAndProductiveAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration