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Condensed Consolidated Statements of Retained Earnings (Unaudited) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Condensed Consolidated Statements of Retained Earnings    
Retained earnings at beginning of period $ 28,077,791us-gaap_RetainedEarningsAccumulatedDeficit $ 27,207,970us-gaap_RetainedEarningsAccumulatedDeficit
Net income 462,473us-gaap_NetIncomeLoss 568,373us-gaap_NetIncomeLoss
Cash dividends declared, $0.43 per share in 2015 and $0.58 per share in 2014 (415,437)us-gaap_Dividends (560,357)us-gaap_Dividends
Retained earnings at end of period $ 28,124,827us-gaap_RetainedEarningsAccumulatedDeficit $ 27,215,986us-gaap_RetainedEarningsAccumulatedDeficit