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Note 16 - Segment Information Report of Statements of Operations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Water Transmission Group [Member] | Operating Segments [Member]      
Net sales $ 173,160 $ 238,545 $ 226,427
Gross profit 606 39,601 46,953
Operating income (loss) [1] (11,592) 31,490 40,343
Depreciation and amortization expense 7,318 8,716 7,082
Capital expenditures 6,313 6,190 13,204
Tubular Products [Member] | Operating Segments [Member]      
Net sales 63,448 164,753 133,018
Gross profit (13,231) 975 13,283
Operating income (loss) [2] (15,699) (16,677) 11,943
Depreciation and amortization expense 1,859 5,090 5,963
Capital expenditures 1,879 7,526 14,354
Corporate Segment [Member]      
Operating income (loss) (12,919) (14,619) (14,751)
Depreciation and amortization expense 438 340 254
Capital expenditures 323 573 889
Operating Segments [Member]      
Operating income (loss) (27,291) 14,813 52,286
Depreciation and amortization expense 9,177 13,806 13,045
Capital expenditures 8,192 13,716 27,558
UNITED STATES      
Net sales 224,691 383,344 308,345
Non-US [Member]      
Net sales 11,917 19,954 51,100
Net sales 236,608 403,298 359,445
Gross profit (12,625) 40,576 60,236
Operating income (loss) (40,210) 194 37,535
Depreciation and amortization expense 9,615 14,146 13,299
Capital expenditures $ 8,515 $ 14,289 $ 28,447
[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.