Capital Stock - Summary of Company stock option plans (Details) (USD $)	6 Months Ended	12 Months Ended
Jun. 30, 2012	Dec. 31, 2011
Notes to Financial Statements
Outstanding at beginning of period	1,448,675	1,341,876
Outstanding at begining of period, Weighted Average Exercise Price	$ 10.425	$ 11.003
Granted at market, options	$ 35,250	$ 187,750
Granted at market, Weighted Average Exercise Price	12.327	6.962
Cancelled, Options	$ (113,830)	$ (73,871)
Cancelled, Weighted Average Excercise Price	11.382	12.684
Exercised, Options	$ (171,062)	$ (7,080)
Exercised, Weighted Average Exercise Price	$ 5.821	$ 4.564
Outstanding at end of period, Options	1,199,033	1,448,675
Outstanding at end of period, Weighted Average Exercise Price	$ 11.047	$ 10.425
Exercisable at end of period, Options	974,025	1,175,731
Exercisable at end of period, Weighted Average Exercise Price	$ 12.146	$ 11.427

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

+ References

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

+ References

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Weighted average price of options that were either forfeited or expired.

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Net number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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- Definition

Weighted average price at which option holders acquired shares when converting their stock options into shares.

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No definition available.

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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