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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |
Advertising expenses | $ 2.7 | $ 2.6 | $ 2.9
Shipping costs | 3.9 | 3.9 | 4.8
Research and development | 8.0 | $ 8.2 | 8.5
Right-of-use asset in exchange for lease liability |  |  | $ 2.0
Purchase price | $ 28.3 |  |
Building [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Useful life | 15 years |  |
Machinery and Equipment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Useful life | 7 years |  |
Tools, Dies and Molds [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Useful life | 3 years |  |
Unaffiliated Castings [Member] | Sales [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Percentage of sales | 1.00% |  |
Firearms [Member] | Sales [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Percentage of sales | 99.00% |  |
Firearms [Member] | Sales [Member] | Non-US [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Percentage of sales | 4.00% |  |

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