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Capital Notes (Narrative) (Details) - USD ($) |  | 6 Months Ended |
--- | --- | --- | ---
Sep. 24, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Apr. 13, 2020
Debt Instrument [Line Items] |  |  |  |
Proceeds used to pay off debt |  |  | $ 5,000,000 |
Capital Notes 4% Due 1/24/2022 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capital notes, interest rate |  | 4.00% |  |
Proceeds used to pay off debt | $ 5,000,000 |  |  |
Capital Notes 3.25% Due 09/30/2025 [Member] | 2020 Offering [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capital notes, interest rate |  | 3.25% |  |
Capital notes, maturity date |  | Sep. 30, 2025 |  |
Principal notes |  |  |  | $ 10,050,000
Full or partial payment date |  | Sep. 30, 2021 |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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