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Note 7 - Share-based Compensation - Restricted Stock Activity (Details) - $ / shares		9 Months Ended
	Apr. 01, 2019	Sep. 30, 2019
Restricted Stock [Member]
Outstanding at beginning of year (in shares)		279,919
Outstanding at beginning of year (in dollars per share)		$ 5
Unvested granted (in shares)		224,218
Granted, grant date fair value (in dollars per share)		$ 17.68
Vested (in shares)		(106,683)
Vested, grant date fair value (in dollars per share)		$ 4.65
Forfeited (in shares)		(26,354)
Forfeited, grant date fair value (in dollars per share)		$ 11.60
Outstanding (in shares)		371,100
Outstanding (in dollars per share)		$ 12.29
Performance-based Restricted Stock [Member]
Outstanding at beginning of year (in shares)
Outstanding at beginning of year (in dollars per share)
Unvested granted (in shares)	29,604	123,851
Granted, grant date fair value (in dollars per share)		$ 17.79
Vested (in shares)
Vested, grant date fair value (in dollars per share)
Outstanding (in shares)		123,851
Outstanding (in dollars per share)		$ 17.79

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ References

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- 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

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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).

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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.

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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.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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