Note 10 - Per Share Data - Unissued Shares of Common Stock Were Reserved for the Following Purposes (Details) - shares	Jun. 29, 2019	Dec. 29, 2018
Future grants of options or shares (in shares)	267,551	442,699
Shares reserved for employee stock purchase plan (in shares)	326,952	386,403
Total (in shares)	1,034,875	1,176,474
Time-based Restricted Stock Units [Member]
Restricted stock units outstanding (in shares)	120,372	147,372
Performance-based Restricted Stock Units [Member]
Restricted stock units outstanding (in shares)	320,000	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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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

+ 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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