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Note 4 - Fair Value Measurements (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Jun. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Water Transmission Group [Member]          
Goodwill, Impairment Loss   $ 5,300      
Goodwill, Impairment Loss   $ 5,282