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Equity Incentive Plans (Narrative) (Details) - USD ($) |  |  |  | 6 Months Ended
--- | --- | --- | --- | ---
Apr. 26, 2021 | Feb. 19, 2021 | Feb. 10, 2021 | Jun. 30, 2021 | Jun. 30, 2020
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Options granted |  |  |  | 72,800 |
Shares underlying unexercised options |  |  |  | 387,300 |
Expected future compensation expense, unexercised options |  |  |  | $ 677,000 |
Options [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Expected future compensation expense, weighted average period for recognition |  |  |  | 4 years 10 months 20 days |
Restricted Stock [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Expected future expenses relating to non-vested restricted shares |  |  |  | $ 288,000 |
Expected future compensation expense, weighted average period for recognition |  |  |  | 3 years 7 months 2 days |
2018 Equity Incentive Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Shares authorized for issuance |  |  |  | 1,000,000 |
2011 Stock Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Shares authorized for issuance |  |  |  | 900,000 |
Directors [Member] | 2018 Equity Incentive Plan [Member] | Options [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Options granted |  |  | 66,000 |  |
Vesting period |  |  | 5 years |  |
Directors [Member] | 2018 Equity Incentive Plan [Member] | Restricted Stock [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Restricted stock issued |  | 300 | 26,400 |  |
Vesting period |  | 2 years | 4 years |  |
Certain Officers [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Options granted | 6,800 |  |  |  |
Vesting period | 5 years |  |  |  |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of cost to be recognized for option under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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