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Note 5 - Earnings Per Share (Details Textual) - shares | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jul. 01, 2018 | Jul. 01, 2018 | Jul. 01, 2019 | Jun. 30, 2019 | Jul. 01, 2018 | Jul. 01, 2018 | Jun. 30, 2018
Dilutive Securities Included in Computation of Earnings Per Share Amount Stock Option | 1,016,668 |  |  |  | 1,016,668 |  | 1,254,286 |
Dilutive Securities Included in Computation of Earnings Per Share Amount Restricted Stock | 31,666 | 17,500 | 1,268,286 | 31,666 |  |  | 17,500 |
Incremental Common Shares Attributable to Share-based Payment Arrangements, Total | 450,793 | 598,061 |  |  | 438,969 |  |  | 540,836
Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 446,250 |  | 401,750 |  | 446,250 | 415,750 |  |

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- Definition Number of employee stock options included in calculation of diluted earnings per share. + References No definition available. + Details
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- Definition Number of restricted shares included in calculation of diluted earnings per share. + References No definition available. + Details
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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 28A -URI http://asc.fasb.org/extlink&oid=117326831&loc=d3e1500-109256 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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