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Condensed consolidated statements of changes in shareholders equity - USD ($)
Common stock issued [Member]
Donated shares [Member]
Additional paid-in capital [Member]
Statutory reserves [Member]
Accumulated deficit [Member]
Accumulated other comprehensive loss [Member]
Treasury shares [Member]
Total
Beginning Balance at Dec. 31, 2016 $ 19,745 $ 14,101,689 $ 145,353,067 $ 1,230,511 $ (141,999,372) $ (1,961,461) $ (4,066,610) $ 12,677,569
Beginning Balance (Shares) at Dec. 31, 2016 19,744,675           (144,206)  
Net loss         (2,068,216)     (2,068,216)
Share-based compensation for employee and director stock awards     252,488         252,488
Common stock issued to employees and directors for stock awards $ 112   (112)          
Common stock issued to employees and directors for stock awards (Shares) 111,499              
Foreign currency translation adjustment           (19,646)   (19,646)
Ending Balance at Mar. 31, 2017 $ 19,857 14,101,689 145,605,443 1,230,511 (144,067,588) (1,981,107) $ (4,066,610) 10,842,195
Ending Balance (Shares) at Mar. 31, 2017 19,856,174           (144,206)  
Beginning Balance at Dec. 31, 2017 $ 26,368 14,101,689 155,711,014 1,230,511 (163,466,713) (1,340,533) $ (4,066,610) 2,195,726
Beginning Balance (Shares) at Dec. 31, 2017 26,367,523           (144,206)  
Net loss         (2,567,833)     (2,567,833)
Share-based compensation for employee and director stock awards     83,573         83,573
Common stock issued to employees and directors for stock awards $ 9   (9)          
Common stock issued to employees and directors for stock awards (Shares) 8,500              
Foreign currency translation adjustment           135,708   135,708
Ending Balance at Mar. 31, 2018 $ 26,377 $ 14,101,689 $ 155,794,578 $ 1,230,511 $ (166,034,546) $ (1,204,825) $ (4,066,610) $ (152,826)
Ending Balance (Shares) at Mar. 31, 2018 26,376,023           (144,206)