Note 10 - Per Share Data - Unissued Shares of Common Stock Were Reserved for the Following Purposes (Details) - shares	Sep. 29, 2018	Dec. 30, 2017
Future grants of options or shares (in shares)	483,071	332,232
Shares reserved for employee stock purchase plan (in shares)	86,403	177,280
Total (in shares)	905,669	996,546
Time-based Restricted Stock Units [Member]
Restricted stock units outstanding (in shares)	96,195	87,034
Performance-based Restricted Stock Units [Member]
Restricted stock units outstanding (in shares)	240,000	400,000

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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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+ References

No definition available.

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+ 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
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