Note 10 - Equity Incentive Plans (Details Textual) - shares		3 Months Ended	6 Months Ended
Jul. 02, 2019	Jun. 30, 2019	Jun. 30, 2019
Stock Incentive Plan 2010 [Member]
Common Stock, Capital Shares Reserved for Future Issuance		1,673,111	1,673,111
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant		1,725,615	1,725,615
Stock Incentive Plan 2010 [Member] \| Subsequent Event [Member]
Stock Issued During Period, Shares, Restricted Stock Award, Gross	254,500
Stock Incentive Plan 2010 [Member] \| Restricted Stock [Member] \| Awards Granted in the Second Quarter of 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		2 years
Employee Stock Purchase Plan [Member]
Common Stock, Capital Shares Reserved for Future Issuance		190	190
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant		190	190
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent			85.00%
Stock Issued During Period, Shares, Employee Stock Purchase Plans		0	0

Aggregate number of common shares reserved for future issuance.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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.

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-Publisher FASB
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-Section 50
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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Purchase price of common stock expressed as a percentage of its fair value.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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