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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Consolidated Balance Sheets    
Property, plant, and equipment, accumulated depreciation $ 28,351 $ 27,970
Leased property under capital lease, accumulated depreciation 1,877 1,700
Accumulated amortization $ 626 $ 469
Series C redeemable convertible Preferred Stock, par value (in dollars per share) $ 0.01 $ 0.01
Series C redeemable convertible Preferred Stock, shares authorized 10,431 10,431
Series C redeemable convertible Preferred Stock, shares issued 5,231 5,231
Series C redeemable convertible Preferred Stock, shares outstanding 5,231 5,231
Series C redeemable convertible Preferred Stock, aggregate involuntary liquidation preference (in dollars) $ 16,664 $ 16,664
Common Stock, par value (in dollars per share) $ 0.01 $ 0.01
Common Stock, shares authorized 450,000,000 450,000,000
Common Stock, shares issued 180,720,285 180,567,444
Common stock in treasury, shares 479,953 479,953