Note 10 - Per Share Data - Unissued Shares of Common Stock Were Reserved for the Following Purposes (Details) - shares	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Exercise of options outstanding (in shares)	0	42,000	44,500
Future grants of options or shares (in shares)	332,232	619,266
Shares reserved for employee stock purchase plan (in shares)	177,280	268,211
Total (in shares)	996,546	1,327,211
Time-based Restricted Stock Units [Member]
Restricted stock units outstanding (in shares)	87,034	197,734
Performance-based Restricted Stock Units [Member]
Restricted stock units outstanding (in shares)	400,000	200,000

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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-Publisher FASB
-Name Accounting Standards Codification
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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