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Industry Segments (Narrative) (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 28, 2013 | Dec. 29, 2012 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |
Number of operating segments (segments) | 2 |  |
Goodwill | $ 18,252,678 | $ 18,252,678 |
Metals Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill | 16,898,000 |  |
Concentration risk (percentage) | 71.00% |  |
Number of suppliers (entities) | 7 |  |
Number of suppliers providing majority of supplies (entities) | 1 |  |
Specialty Chemicals Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill | 1,355,000 | 1,355,000 |
Concentration risk (percentage) | 50.00% |  |
Number of suppliers providing majority of supplies (entities) | 7 |  |
Corporate [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Environmental charges | $ 17,000 | $ 46,000 | $ 8,000
Supplier One [Member] | Metals Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration risk (percentage) | 24.00% |  |
Revenue [Member] | Metals Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of major customers (entities) |  | 0 |
Concentration risk (percentage) | 11.00% |  | 10.00%
Revenue [Member] | Specialty Chemicals Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration risk (percentage) | 40.00% | 28.00% | 24.00%
United States [Member] | Metals Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of major customers (entities) | 1 |  |
United States [Member] | Specialty Chemicals Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of major customers (entities) | 1 |  |
Bristol Metals, LLC, Ram-Fab, LLC and Palmer of Texas Tanks, Inc. [Member] | Metals Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Ownership percentage of subsidiary (percent) | 100.00% |  |
Manufacturers Soap and Chemical Company [Member] | Specialty Chemicals Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Ownership percentage of subsidiary (percent) | 100.00% |  |
Maximum [Member] | Revenue [Member] | Metals Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration risk (percentage) |  | 10.00% |

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