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Note 12 - Equity Incentive Plan (Details Textual) - USD ($) $ in Thousands		3 Months Ended
	Jan. 29, 2020	Mar. 31, 2020	Mar. 31, 2019
Share-based Compensation, One-time Benefit for Unexpected Death of Former President	$ 1,800
Share-based Payment Arrangement, Expense		$ (207)	$ 1,386
Stock Options, PSUs and RSUs to Employees and RSUs to Non-employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)		3 years
Performance Shares [Member]
Performance Conditions, Business Target, Percentage of Performance Conditions Based on Achievement in Current Fiscal Year		40.00%
Performance Conditions, Financial Target, Percentage of Performance Conditions Based on Company’s Operating Results in next Fiscal Year		60.00%
Share-based Payment Arrangement, Expense		$ 500

X

- Definition

Represents the percentage of performance conditions based on achievement in current fiscal year set as business target.

+ References

No definition available.

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- Definition

Represents the percentage of performance conditions based on company’s operating results in next fiscal year set as business target.

+ References

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- Definition

The amount of share-based compensation benefit recognized during period related to the unexpected death of former president.

+ References

No definition available.

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Section S99
-Paragraph 1
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-Section 50
-Paragraph 2
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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

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