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CONSOLIDATED BALANCE SHEETS (Parenthetical) - shares
Dec. 31, 2018
Dec. 31, 2017
Shareholders equity:    
Common stock, authorized 20,000,000 20,000,000
Common stock, issued 2,229,609 2,229,609
Common stock, outstanding 2,061,909 2,061,909
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