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Note 3 - Stock-based Compensation - Activity Related to Restricted Stock Units Awarded (Details) - Restricted Stock [Member] | 3 Months Ended
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Mar. 31, 2020 $ / shares shares
Nonvested (in shares) | shares | 61,040
Nonvested, weighted average grant date fair value per share (in dollars per share) | $ / shares | $ 21.73
Granted (in shares) | shares | 23,648
Granted, weighted average grant date fair value per share (in dollars per share) | $ / shares | $ 26.09
Nonvested (in shares) | shares | 84,688
Nonvested, weighted average grant date fair value per share (in dollars per share) | $ / shares | $ 22.94
Expected to vest as of March 31, 2020 (in shares) | shares | 1,000
Expected to vest as of March 31, 2020 (in dollars per share) | $ / shares | $ 22.65

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- Definition The amount of share-based compensation arrangement by share-based payment award, equity instruments other than options that are expected to vest. + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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- Definition The weighted average fair value as of the grant date pertaining to an equity-based award plan other than a stock (or unit) option plan that is expected to vest. + References No definition available. + Details
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X
- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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X
- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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X
- 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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- Definition Per share or unit weighted-average fair value of 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 (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Details
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