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Note 17 - Segment Information - Segment Information Report of Statements of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
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 |
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,969 |  | 9,615 |  | 14,146 |
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,292 |  | 8,515 |  | 14,289 |
UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 144,280 |  | 224,691 |  | 383,344 |
CANADA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,976 |  | 11,917 |  | 19,954 |
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,287) |  | (27,291) |  | 14,813 |
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,526 |  | 9,177 |  | 13,806 |
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,072 |  | 8,192 |  | 13,716 |
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]
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,750 |  | 7,318 |  | 8,716 |
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,072 |  | 6,313 |  | 6,190 |
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]
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 776 |  | 1,859 |  | 5,090 |
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,879 |  | 7,526 |
Corporate Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (11,246) |  | (12,919) |  | (14,619) |
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 443 |  | 438 |  | 340 |
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 220 |  | $ 323 |  | $ 573 |
[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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