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Summary of Significant Accounting Policies (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 USD ($) Bank | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2001 USD ($) | Mar. 20, 2015 USD ($) | Dec. 31, 2012 USD ($)
Business acquisition: |  |  |  |  |  |
Goodwill | $ 2,403,000 | $ 1,097,000 |  |  |  |
Goodwill, Impairment Loss | 0 | 0 | $ 0 |  |  |
Billed contracts receivable | 21,967,000 | 10,407,000 |  |  |  |
Costs incurred on uncompleted contracts | 19,696,000 | 2,339,000 |  |  |  |
Tooling in progress | $ 2,271,000 | 8,068,000 |  |  |  |
Number of banks in which cash is held | Bank | 1 |  |  |  |  |
Cash and cash equivalents | $ 8,943,000 | 2,312,000 | 2,266,000 |  |  | $ 7,838,000
Allowance for doubtful accounts | 40,000 | 289,000 |  |  |  |
Allowance for chargebacks | 523,000 | 813,000 |  |  |  |
Allowance for slow moving and obsolete inventory | 863,000 | 940,000 |  |  |  |
Self-insurance reserve | 1,074,000 | 1,165,000 |  |  |  |
Postemployment Benefits Liability | 9,006,000 | 9,172,000 |  |  |  |
Research and development expense | 719,000 | 475,000 | 466,000 |  |  |
Foreign Currency Transaction Gain (Loss), before Tax | 54,000 | $ (108,000) | $ (27,000) |  |  |
CPI [Member] |  |  |  |  |  |
Business acquisition: |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  | $ 650,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  |  |  | $ 12,474,000 |
Goodwill, acquired during period | $ 1,306,000 |  |  |  |  |
Airshield Corporation |  |  |  |  |  |
Business acquisition: |  |  |  |  |  |
Goodwill, acquired during period |  |  |  | $ 1,097,000 |  |

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