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Summary of Significant Accounting Policies (Details) | 12 Months Ended
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Dec. 31, 2020 USD ($) segment | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Property, Plant and Equipment |  |  |
Number of reporting segments | segment | 2 |  |
Cash and cash equivalents | $ 7,564,000 | $ 14,178,000 |
Impairments of long lived assets | 0 | 0 | $ 0
Goodwill impairment | 0 | 0 | 0
Impairment of finite lived intangible assets | 0 | 0 | 0
Product warranty reserve | 1,249,000 | 1,222,000 |
Foreign currency transaction loss | (32,000) | 202,000 | (483,000)
Research and development expenses | $ 2,643,000 | 2,614,000 | $ 2,646,000
Buildings | Minimum |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment useful life | 7 years |  |
Buildings | Maximum |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment useful life | 40 years |  |
Machinery and equipment | Minimum |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment useful life | 2 years |  |
Machinery and equipment | Maximum |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment useful life | 50 years |  |
Leasehold improvements | Minimum |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment useful life | 7 years |  |
Leasehold improvements | Maximum |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment useful life | 19 years |  |
Non Domestic |  |  |
Property, Plant and Equipment |  |  |
Cash and cash equivalents | $ 6,995,000 | 13,660,000 |
Bank term deposits | $ 18,000 | $ 17,000 |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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