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Comprehensive Income Statement (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Comprehensive Income Statement    
Net earnings $ 2,033,266 $ 1,662,183
Net unrealized gains (losses) on derivative instruments (578,647) 650,093
Net unrealized gains on available for sale securities 203,221 329,837
Other comprehensive income (loss) (375,426) 979,930
Comprehensive income $ 1,657,840 $ 2,642,113