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Note 17 - Segment Information (Details Textual) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2015 | Dec. 31, 2016 | Jun. 30, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Restructuring Charges | $ 600 |  |  | $ 990 |  |
Goodwill, Impairment Loss |  |  |  |  | 5,282 | 16,066
Property, Plant and Equipment, Net |  | $ 118,101 |  | 118,101 | 131,848 |
MEXICO |  |  |  |  |  |
Property, Plant and Equipment, Net |  | 4,100 |  | 4,100 | 4,300 |
Denver Facility [Member] |  |  |  |  |  |
Gain (Loss) on Disposition of Property Plant Equipment |  | 7,900 |  | 7,860 |  |
Water Transmission Group [Member] |  |  |  |  |  |
Restructuring Charges |  |  |  | 1,000 |  |
Goodwill, Impairment Loss |  |  | $ 5,300 |  | $ 5,300 |
Water Transmission Group [Member] | Denver Facility [Member] |  |  |  |  |  |
Gain (Loss) on Disposition of Property Plant Equipment |  | $ 7,900 |  | $ 7,900 |  |
Tubular Products [Member] |  |  |  |  |  |
Goodwill, Impairment Loss |  |  |  |  |  | $ 16,100
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customer One [Member] | Water Transmission Group [Member] |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  | 27.00% |  | 16.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customer Two [Member] | Tubular Products [Member] |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  | 10.00%

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