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Note 19 - Summary of Quarterly Financial Data (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Water Transmission Group [Member] | Operating Segments [Member]                    
Net sales $ 38,681 $ 39,792 $ 38,445 $ 56,242 $ 56,484 $ 76,857 $ 62,205 $ 42,999 $ 173,160 $ 238,545
Gross profit (7,443) (725) 1,255 7,519 9,883 16,559 11,491 1,668 606 39,601
Operating income (loss) (9,026) (2,384) (5,815) 5,633 7,817 14,429 9,543 (299) (11,592) [1] 31,490 [1]
Tubular Products [Member] | Operating Segments [Member]                    
Net sales 6,881 12,543 15,401 28,623 45,674 39,648 39,783 39,648 63,448 164,753
Gross profit (3,969) (1,786) (3,848) (3,628) (758) (739) (174) 2,646 (13,231) 975
Operating income (loss) (4,530) (2,298) (4,254) (4,617) (17,227) (1,155) (589) 2,294 (15,699) [2] (16,677) [2]
Operating Segments [Member]                    
Operating income (loss)                 (27,291) 14,813
Corporate, Non-Segment [Member]                    
Operating income (loss) (2,960) (2,602) (3,258) (4,099) (4,000) (3,943) (3,555) (3,121) (12,919) (14,619)
Net sales 45,562 52,335 53,846 84,865 102,158 116,505 101,988 82,647 236,608 403,298
Gross profit (11,412) (2,511) (2,593) 3,891 9,125 15,820 11,317 4,314 (12,625) 40,576
Operating income (loss) (16,516) (7,284) (13,327) (3,083) (13,410) 9,331 5,399 (1,126) (40,210) 194
Net income (loss) $ (13,693) $ (1,515) $ (12,079) $ (2,101) $ (13,996) $ 5,021 $ 3,192 $ (12,104) $ (29,388) $ (17,887)
Continuing operations (in dollars per share) $ (1.43) $ (0.16) $ (1.26) $ (0.22) $ (1.47) $ 0.62 $ 0.34 $ (0.13) $ (3.07) $ (0.65)
Discontinued operations (in dollars per share) (0.09) (1.14) (1.23)
Total (in dollars per share) $ (1.43) $ (0.16) $ (1.26) $ (0.22) $ (1.47) 0.53 $ 0.34 (1.27) $ (3.07) (1.88)
Continuing Operations (in dollars per share) $ (1.43) $ (0.16) $ (1.26) $ (0.22) $ (1.47) 0.61 $ 0.33 (0.13) $ (3.07) (0.65)
Discontinued Operations (in dollars per share) (0.09) (1.14) (1.23)
Total (in dollars per share) $ (1.43) $ (0.16) $ (1.26) $ (0.22) $ (1.47) $ 0.52 $ 0.33 $ (1.27) $ (3.07) $ (1.88)
[1] Operating loss for Water transmission for 2015 includes the write-off of goodwill of $5.3 million.
[2] Operating loss for Tubular products for 2014 includes the write-off of goodwill of $16.1 million.