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Summary of Significant Accounting Policies (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 USD ($) Bank | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2001 USD ($) | Mar. 20, 2015 USD ($) | Dec. 31, 2013 USD ($)
Business acquisition: |  |  |  |  |  |
Net foreign translation and transaction activity | $ 89,000 | $ 54,000 | $ (108,000) |  |  |
Goodwill | 2,403,000 | 2,403,000 |  |  |  |
Goodwill, Impairment Loss | 0 | 0 | 0 |  |  |
Asset Impairment Charges | 0 | 0 | 0 |  |  |
Billed contracts receivable | 11,052,000 | 21,967,000 |  |  |  |
Costs incurred on uncompleted contracts | 9,968,000 | 19,696,000 |  |  |  |
Tooling in progress | $ 1,084,000 | 2,271,000 |  |  |  |
Number of banks in which cash is held | Bank | 1 |  |  |  |  |
Cash and cash equivalents | $ 28,285,000 | 8,943,000 | 2,312,000 |  |  | $ 2,266,000
Allowance for doubtful accounts | 0 | 40,000 |  |  |  |
Allowance for chargebacks | 309,000 | 523,000 |  |  |  |
Allowance for slow moving and obsolete inventory | 770,000 | 863,000 |  |  |  |
Self-insurance reserve | 1,139,000 | 1,074,000 |  |  |  |
Postemployment Benefits Liability | 8,667,000 | 9,006,000 |  |  |  |
Research and development expense | $ 965,000 | 719,000 | $ 475,000 |  |  |
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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