Note 10 - Per Share Data - Unissued Shares of Common Stock Were Reserved for the Following Purposes (Details) - shares	Dec. 28, 2019	Dec. 29, 2018
Future grants of options or shares (in shares)	268,326	442,699
Shares reserved for employee stock purchase plan (in shares)	267,877	386,403
Total (in shares)	927,928	1,176,474
Time-based Restricted Stock Units [Member]
Restricted stock units outstanding (in shares)	151,725	147,372
Performance-based Restricted Stock Units [Member]
Restricted stock units outstanding (in shares)	240,000	200,000

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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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