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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Accounts receivable-trade, allowance $ 204 $ 225
Inventories, allowance 60 60
Redeemable convertible preferred stock, Series A, discount $ 617 $ 671
Redeemable convertible preferred stock, par value $ 0.001 $ 0.001
Redeemable convertible preferred stock, shares authorized 1,000,000 1,000,000
Redeemable convertible preferred stock, shares issued 1,000,000 1,000,000
Redeemable convertible preferred stock, shares outstanding 1,000,000 1,000,000
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 50,000,000 50,000,000
Common stock, shares issued 8,499,508 8,385,929
Common stock, shares outstanding 8,335,968 8,254,001
Treasury stock, shares 163,540 131,928
Equity Method Investments    
Retained (deficit) earnings; accumulated statutory reserves in equity method investments $ 2,887 $ 2,722