Note 10 - Per Share Data - Unissued Shares of Common Stock Were Reserved for the Following Purposes (Details) - shares	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Exercise of options outstanding (in shares)	42,000	44,500	53,000
Future grants of options or shares (in shares)	619,266	382,000
Shares reserved for employee stock purchase plan (in shares)	268,211	349,436
Total (in shares)	1,327,211	984,770
Time-based Restricted Stock Units [Member]
Restricted stock units outstanding (in shares)	197,734	208,834
Performance-based Restricted Stock Units [Member]
Restricted stock units outstanding (in shares)	200,000	0

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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

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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=6415400&loc=d3e5070-113901

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-Name Accounting Standards Codification
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Number of options outstanding, including both vested and non-vested options.

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