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CONDENSED CONSOLIDATED BALANCE SHEETS PARENTHETICALS - USD ($)
Mar. 31, 2017
Dec. 31, 2016
Parentheticals    
Allowance for doubtful accounts on trade accounts receivable $ 16,161,252 $ 15,664,496
Allowance for doubtful accounts on other receivables $ 56,157 $ 71,548
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, shares authorized 5,000,000 5,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 95,000,000 95,000,000
Common stock, shares issued 43,579,557 43,579,557
Common stock, shares outstanding 43,579,557 43,579,557