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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Current assets:    
Allowance for uncollectible accounts $ 200 $ 200
Capitalization:    
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 36,000,000 36,000,000
Common stock, shares issued 20,456,225 20,381,949
Common stock, shares outstanding 20,456,225 20,381,949