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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Dec. 31, 2020
Dec. 31, 2019
Shareholders equity:    
Common stock, authorized 20,000,000 20,000,000
Common stock, issued 3,260,559 3,260,559
Common stock, outstanding 3,260,559 3,092,859
Common stock, no par value $ 0.00 $ 0.00
Treasury stock, shares 167,700 167,700
ZHEJIANG TIANLAN    
Shareholders equity:    
Common stock, authorized 82,572,000 82,572,000
Common stock, issued 82,572,000 82,572,000
Common stock, outstanding 82,572,000 82,572,000