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Consolidated Statements of Comprehensive Income (Loss) (Parentheticals) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Statement Of Other Comprehensive Income [Abstract]      
Unrealized holding gains (losses) arising during the period, deferred taxes (benefits) $ 145,606 $ 1,305,107 $ (2,167,273)
Reclassification adjustment for impairment loss included in net income, deferred tax benefits 0 0 6,197
Reclassification adjustment for gains included in net income, deferred taxes $ 412,730 $ 459,212 $ 243,383