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Note 7 - Segment Information (Details Textual)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Water Transmission Group [Member]          
Goodwill, Impairment Loss   $ 5,300      
Number of Reportable Segments       2  
Goodwill, Impairment Loss   $ 5,282