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Note 7 - Segment Information (Details Textual)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Water Transmission Group [Member]        
Goodwill, Impairment Loss   $ 5,300   $ 5,300
Goodwill, Impairment Loss $ 5,282 $ 5,282
Number of Reportable Segments     2