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Note 20 - Quarterly Data (Unaudited) - Summary of Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Net sales | $ 39,179 |  | $ 41,088 |  | $ 42,061 |  | $ 33,928 |  | $ 45,562 |  | $ 52,335 |  | $ 53,846 |  | $ 84,865 |  | $ 156,256 |  | $ 236,608 |  | $ 403,298 |
Gross profit (loss) | 2,251 |  | 2,123 |  | (2,162) |  | (5,437) |  | (11,412) |  | (2,511) |  | (2,593) |  | 3,891 |  | (3,225) |  | (12,625) |  | 40,576 |
Operating income (loss) | 4,819 |  | (2,063) |  | (6,253) |  | (10,036) |  | (16,516) |  | (7,284) |  | (13,327) |  | (3,083) |  | (13,533) |  | (40,210) |  | 194 |
Net income (loss) | $ 5,834 |  | $ 727 |  | $ (6,242) |  | $ (9,583) |  | $ (13,693) |  | $ (1,515) |  | $ (12,079) |  | $ (2,101) |  | $ (9,263) |  | $ (29,388) |  | $ (17,887) |
Basic (in dollars per share) | $ 0.61 |  | $ 0.08 |  | $ (0.65) |  | $ (1) |  |  |  |  |  |  |  |  |  | $ (0.97) |  |  |  |  |
Diluted (in dollars per share) | $ 0.60 |  | $ 0.08 |  | $ (0.65) |  | $ (1) |  |  |  |  |  |  |  |  |  | (0.97) |  |  |  |  |
Total (in dollars per share) |  |  |  |  |  |  |  |  | $ (1.43) |  | $ (0.16) |  | $ (1.26) |  | $ (0.22) |  | $ (0.97) |  | $ (3.07) |  | $ (1.88) |
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (2,287) |  | $ (27,291) |  | $ 14,813 |
Corporate, Non-Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) | $ (3,135) |  | $ (2,624) |  | $ (2,603) |  | $ (2,884) |  | $ (2,960) |  | $ (2,602) |  | $ (3,258) |  | $ (4,099) |  | (11,246) |  | (12,919) |  |  |
Water Transmission Group [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | 39,179 |  | 41,075 |  | 39,775 |  | 29,358 |  | 38,681 |  | 39,792 |  | 38,445 |  | 56,242 |  | 149,387 |  | 173,160 |  | 238,545 |
Gross profit (loss) | 3,767 |  | 2,939 |  | (1,272) |  | (5,750) |  | (7,443) |  | (725) |  | 1,255 |  | 7,519 |  | (317) |  | 606 |  | 39,601 |
Operating income (loss) | 9,590 | [1] | 1,363 | [1] | (2,648) | [1] | (7,256) | [1] | (9,026) | [2] | (2,384) | [2] | (5,815) | [2] | 5,633 | [2] | 1,049 | [1],[3] | (11,592) | [2],[3] | 31,490 | [3]
Tubular Products [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  | 13 |  | 2,286 |  | 4,570 |  | 6,881 |  | 12,543 |  | 15,401 |  | 28,623 |  | 6,869 |  | 63,448 |  | 164,753 |
Gross profit (loss) | (1,516) |  | (816) |  | (890) |  | 313 |  | (3,969) |  | (1,786) |  | (3,848) |  | (3,628) |  | (2,908) |  | (13,231) |  | 975 |
Operating income (loss) | $ (1,636) |  | $ (802) |  | $ (1,002) |  | $ 104 |  | $ (4,530) |  | $ (2,298) |  | $ (4,254) |  | $ (4,617) |  | $ (3,336) | [4] | $ (15,699) | [4] | $ (16,677) | [4]
[1] | Operating income for Water Transmission for the fourth quarter of 2016 includes the gain on sale of facility of $7.9 million.
[2] | Operating loss for Water Transmission for the second quarter of 2015 includes the write-off of goodwill of $5.3 million.
[3] | Operating income for Water Transmission for 2016 includes restructuring expenses of $1.0 million and gain on sale of facility of $7.9 million. Operating loss for Water Transmission for 2015 includes the write-off of goodwill of $5.3 million.
[4] | Operating loss for Tubular Products for 2014 includes the write-off of goodwill of $16.1 million.

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