Accrued Liabilities (Details) - Accrued liabilities - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accrued liabilities [Abstract]
Taxes payable	$ 1,059	$ 1,063
Current portion of pension liability (see Note 14)	1,010	1,442
Deferred revenues	931	1,721
Directors fees	684	532
Compensation and employee benefits	614	678
Interest payable	522	640
Warranty reserve	389	345	$ 288
Audit fees	137	194
Legal fees payable	68	242
Installation costs	46	197
Other	676	803
Accrued Liabilities, Total	$ 6,136	$ 7,857