Note 10 - Per Share Data - Unissued Shares of Common Stock Were Reserved for the Following Purposes (Details) - shares	Apr. 01, 2017	Dec. 31, 2016
Exercise of options outstanding (in shares)	42,000	42,000
Future grants of options or shares (in shares)	419,266	619,266
Shares reserved for employee stock purchase plan (in shares)	224,463	268,211
Total (in shares)	1,283,463	1,327,211
Time-based Restricted Stock Units [Member]
Restricted stock units outstanding (in shares)	197,734	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
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-Subparagraph (c)(1)(i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Number of options outstanding, including both vested and non-vested options.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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