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Schedule II Valuation and Qualifying Accounts (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Jan. 03, 2015
Allowance for Doubtful Accounts [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | $ 247,000 | $ 1,115,000 | $ 1,079,000
Charged to (Reduction of) Cost and Expenses | (45,000) | 104,000 | 667,000
Deductions | (120,000) | (972,000) | (631,000)
Balance at End of Period | 82,000 | 247,000 | 1,115,000
Allowance for Doubtful Accounts [Member] | Specialty Pipe And Tube, Inc. [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Charged to (Reduction of) Cost and Expenses |  |  | 76,000
Allowance for Doubtful Accounts [Member] | Notes Receivable [Member] | Palmer of Texas [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Charged to (Reduction of) Cost and Expenses |  | 801,000 |
Increase (Decrease) in Accounts Receivable |  | 299,000 |
Inventory Valuation Reserve [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | 682,000 | 725,000 | 2,206,000
Charged to (Reduction of) Cost and Expenses | 984,000 | 767,000 | 3,975,000
Deductions | (700,000) | (810,000) | (5,456,000)
Balance at End of Period | $ 966,000 | $ 682,000 | 725,000
Inventory Valuation Reserve [Member] | Other Expense [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Deductions |  |  | (4,813,000)
Bristol Fab and Ram-fab [Member] | Inventory Valuation Reserve [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Charged to (Reduction of) Cost and Expenses |  |  | $ 3,109,000

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- Definition The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Amount of increase in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges to costs and expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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