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Investments (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($) a facility | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Schedule of Equity Method Investments |  |  |
Equity method investment | $ 162,000 | $ 4,031,000 |
Equity method investments, impairment |  | 0 | $ 0
Equity in income (loss) of nonconsolidated investments | $ 6,000 | (1,290,000) | (413,000)
Lb Pipe Coupling Products Llc |  |  |
Schedule of Equity Method Investments |  |  |
Equity method investment ownership percentage | 45.00% |  |
Equity method investment | $ 3,875,000 | 3,902,000 |
Impairment of long lived assets to be disposed of | 413,000 |  |
Due from joint venture | 1,235,000 |  |
Equity in income (loss) of nonconsolidated investments | $ 386,000 | (1,345,000) | $ (410,000)
Lb Pipe Coupling Products Llc | Capital Leased Land |  |  |
Schedule of Equity Method Investments |  |  |
Area of land | a | 5 |  |
Number of facilities | facility | 2 |  |
Capital lease length of renewal term | 5 years 6 months |  |
Monthly rent | $ 17,000 |  |
Balloon payment | $ 488,000 |  |
Lb Pipe Coupling Products Llc | Third Party |  |  |
Schedule of Equity Method Investments |  |  |
Equity method investment ownership percentage | 45.00% |  |
LB Pipe JV |  |  |
Schedule of Equity Method Investments |  |  |
Maximum lending capacity | $ 1,350,000 |  |
Other equity investments |  |  |
Schedule of Equity Method Investments |  |  |
Equity method investment | 162,000 | $ 129,000 |
Fair Value | Lb Pipe Coupling Products Llc |  |  |
Schedule of Equity Method Investments |  |  |
Equity method investment | 3,875,000 |  |
Carrying value | Lb Pipe Coupling Products Llc |  |  |
Schedule of Equity Method Investments |  |  |
Equity method investment | $ 4,288,000 |  |

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