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Derivative Financial Instruments (Details 4) (Binomial Lattice Technique [Member], USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Level 1 [Member] |  |  |
Significant assumptions utilized in valuation technique |  |  |
Linked common shares | 1,725,000 | 1,800,000 | 1,725,000
Quoted market price on valuation date | $ 3.26 | $ 3.11 | $ 2.97
Contractual exercise rate | $ 2.4648 | $ 2.50 | $ 2.4648
Term (years) | 6 months 11 days | 1 year 6 months 11 days | 9 months 11 days
Level 1 [Member] | Minimum [Member] |  |  |
Significant assumptions utilized in valuation technique |  |  |
Range of market volatilities | 33.80% | 40.80% | 33.10%
Risk free rates using zero coupon US Treasury security rates | 0.04% | 0.05% | 0.02%
Level 1 [Member] | Maximum [Member] |  |  |
Significant assumptions utilized in valuation technique |  |  |
Range of market volatilities | 44.40% | 77.70% | 49.17%
Risk free rates using zero coupon US Treasury security rates | 0.11% | 0.26% | 0.11%
Level 2 [Member] |  |  |
Significant assumptions utilized in valuation technique |  |  |
Linked common shares | 525,000 | 525,000 | 525,000
Quoted market price on valuation date | $ 3.26 | $ 3.11 | $ 2.97
Contractual exercise rate | $ 2.4648 | $ 2.75 | $ 2.4648
Term (years) | 1 year 15 days | 2 years 15 days | 1 year 3 months 11 days
Level 2 [Member] | Minimum [Member] |  |  |
Significant assumptions utilized in valuation technique |  |  |
Range of market volatilities | 34.10% | 42.70% | 33.80%
Risk free rates using zero coupon US Treasury security rates | 0.04% | 0.09% | 0.02%
Level 2 [Member] | Maximum [Member] |  |  |
Significant assumptions utilized in valuation technique |  |  |
Range of market volatilities | 45.30% | 78.30% | 63.60%
Risk free rates using zero coupon US Treasury security rates | 0.14% | 0.33% | 0.16%
Level 3 [Member] |  |  |
Significant assumptions utilized in valuation technique |  |  |
Linked common shares | 1,562,500 | 1,302,083 | 1,562,500
Quoted market price on valuation date | $ 3.26 | $ 3.11 | $ 2.97
Contractual exercise rate | $ 3.60 | $ 4.32 | $ 3.60
Term (years) | 4 years 1 month 6 days | 5 years 1 month 10 days | 4 years 4 months 6 days
Custom lattice variable: Probability of exercisability (434,027 linked common shares) |  | 90.00% |
Level 3 [Member] | Minimum [Member] |  |  |
Significant assumptions utilized in valuation technique |  |  |
Range of market volatilities | 34.10% | 49.00% | 39.20%
Risk free rates using zero coupon US Treasury security rates | 0.07% | 0.07% | 0.05%
Level 3 [Member] | Maximum [Member] |  |  |
Significant assumptions utilized in valuation technique |  |  |
Range of market volatilities | 67.70% | 77.40% | 70.20%
Risk free rates using zero coupon US Treasury security rates | 0.57% | 1.04% | 0.54%

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- Definition Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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