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Note 6 - Stock-based Compensation - Outstanding Performance Shares (Details) - Performance Shares [Member] - shares | Aug. 01, 2020 | Feb. 01, 2020
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Performance shares (in shares) | 179,067 | 262,964
Vesting Upon Achievement of 2018-2020 Consolidated Total Revenues Growth Objectives [Member] |  |
Performance shares (in shares) | 20,756 |
Vesting Upon Achievement of 2017-2019 Consolidated Pre-tax Income Target [Member] |  |
Performance shares (in shares) | 62,500 |
Vesting Upon Achievement of 2018-2020 Consolidated Pre-tax Income Growth Objectives [Member] |  |
Performance shares (in shares) | 95,811 |

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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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 (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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