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Liability Related to the Sale of Future Proceeds from Disposition of Subsidiary (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended
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Jan. 15, 2019 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Liability Related To Sale Of Future Proceeds From Disposition Of Subsidiary [Abstract] |  |  |  |  |
Sale of subsidiary, description |  |  |  | In connection with the sale of the Company’s wholly-owned subsidiary, AMK Welding, Inc. (“AMK”) to Meyer Tool, Inc., (“Meyer”) in 2017, Meyer was obligated to pay the Company within 30 days after the end of each calendar quarter, commencing April 1, 2017, an amount equal to five (5%) percent of the net sales of AMK for that quarter until the aggregate payments made to the Company (the “Meyer Agreement”) equals $1,500,000 (the “Maximum Amount”). |
Purchase agreement, description | the Company entered into a “Purchase Agreement” with 15 accredited investors (the “Purchasers”), including Michael and Robert Taglich, pursuant to which the Company assigned to the Purchasers all of its rights, title and interest to the remaining $1,137,000 of the $1,500,000 in payments due from Meyer for the sale of AMK (the “Remaining Amount”) for an immediate payment of $800,000, including $100,000 from each of Michael and Robert Taglich, and $75,000 for the benefit of the children of Michael Taglich. The timing of the payments is based upon the net sales of AMK. If the Purchasers have not received the entire Remaining Amount by March 31, 2023, they have the right to demand payment of their pro rata portion of the unpaid Remaining Amount from the Company (“Put Right”). To the extent the Purchasers exercise their Put Right, the remaining payments from Meyer will be retained by the Company. |  |  |  |
Non-Cash other income |  | $ 91,000 | $ 119,000 | $ 195,000 | $ 211,000
Non-Cash interest expense |  | $ 27,000 | $ 36,000 | $ 58,000 | $ 64,000

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- Definition Description of stock transaction which may include details of the offering (IPO, private placement), a description of the stock sold, percentage of subsidiary's or equity investee's stock sold, a description of the investors and whether the stock was issued in a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4582445-111684 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=123454820&loc=SL4569655-111683 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 + Details
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