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4. Lines of Credit (Detail) (USD $)
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3 Months Ended | 12 Months Ended | 170 Months Ended | ||
|---|---|---|---|---|---|
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Mar. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2012
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| Line of Credit Facility, Maximum Borrowing Capacity | $ 4,000,000 | $ 6,000,000 | $ 2,000,000 | $ 1 | $ 6,000,000 |
| Line of Credit Facility, Interest Rate During Period | 1.00% | 1.00% | |||
| Line of Credit Facility, Increase, Additional Borrowings | 1,000,000 | ||||
| Line of Credit, Current | 389,070 | 765,366 | 389,070 | ||
| Line of Credit Facility, Periodic Payment, Interest | 238,184 | 154,349 | |||
| Line of Credit Facility, Current Borrowing Capacity | 2,000,000 | 1,610,930 | 2,000,000 | ||
| Interest Payable | 1,426,294 | 1,930,695 | 1,426,294 | ||
| Interest Expense | 6,461,210 | 3,312,298 | 24,772,037 | ||
| Option Granted as Consideration for Line of Credit | $ 124,250,000 | $ 124,250,000 | |||
| X | ||||||||||
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- Definition
Consideration given by issuer of lines of credit to provide an incentive. No definition available.
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| X | ||||||||||
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- Definition
The cost of borrowed funds accounted for as interest that was charged against earnings during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Increase for additional borrowings on the credit facility during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The effective interest rate during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of the required periodic payment applied to interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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