Note 10 - Per Share Data - Unissued Shares of Common Stock Were Reserved for the Following Purposes (Details) - shares	Mar. 31, 2018	Dec. 30, 2017
Future grants of options or shares (in shares)	332,232	332,232
Shares reserved for employee stock purchase plan (in shares)	131,872	177,280
Total (in shares)	951,138	996,546
Time-based Restricted Stock Units [Member]
Restricted stock units outstanding (in shares)	87,034	87,034
Performance-based Restricted Stock Units [Member]
Restricted stock units outstanding (in shares)	400,000	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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