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Note 8 - Benefit Plans - The Company's Pension Plan Assets Measured at Fair Value (Details) - USD ($) $ in Thousands | Dec. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Total pension plan assets | $ 48,123 | $ 42,208
Cash and Cash Equivalents [Member] |  |
Total pension plan assets | 404 | 1,428
Fair Value, Inputs, Level 1 [Member] |  |
Total pension plan assets | 9,292 | 8,638
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member] |  |
Total pension plan assets | 173 | 476
Fair Value, Inputs, Level 2 [Member] |  |
Total pension plan assets |  |
Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member] |  |
Total pension plan assets |  |
Fair Value, Inputs, Level 3 [Member] |  |
Total pension plan assets |  |
Fair Value, Inputs, Level 3 [Member] | Cash and Cash Equivalents [Member] |  |
Total pension plan assets |  |
Fair Value Measured at Net Asset Value Per Share [Member] |  |
Total pension plan assets | 38,831 | 33,570
Fair Value Measured at Net Asset Value Per Share [Member] | Cash and Cash Equivalents [Member] |  |
Total pension plan assets | 231 | 952
Global Equity Index Fund [Member] | Equity Securities [Member] |  |
Total pension plan assets | 7,898 | 6,321
Global Equity Index Fund [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] |  |
Total pension plan assets |  |
Global Equity Index Fund [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] |  |
Total pension plan assets |  |
Global Equity Index Fund [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] |  |
Total pension plan assets |  |
Global Equity Index Fund [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Equity Securities [Member] |  |
Total pension plan assets | 7,898 | 6,321
Global Equity GBP Hedge Fund [Member] | Equity Securities [Member] |  |
Total pension plan assets | 8,134 | 6,406
Global Equity GBP Hedge Fund [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] |  |
Total pension plan assets |  |
Global Equity GBP Hedge Fund [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] |  |
Total pension plan assets |  |
Global Equity GBP Hedge Fund [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] |  |
Total pension plan assets |  |
Global Equity GBP Hedge Fund [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Equity Securities [Member] |  |
Total pension plan assets | 8,134 | 6,406
Philippine Stock [Member] | Equity Securities [Member] |  |
Total pension plan assets | 1,031 | 906
Philippine Stock [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] |  |
Total pension plan assets | 1,031 | 906
Philippine Stock [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] |  |
Total pension plan assets |  |
Philippine Stock [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] |  |
Total pension plan assets |  |
Philippine Stock [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Equity Securities [Member] |  |
Total pension plan assets |  |
Investment Grade Corporate Bond Funds [Member] | Debt Securities [Member] |  |
Total pension plan assets | 6,003 | 5,372
Investment Grade Corporate Bond Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member] |  |
Total pension plan assets | 6,003 | 5,372
Investment Grade Corporate Bond Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] |  |
Total pension plan assets |  |
Investment Grade Corporate Bond Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] |  |
Total pension plan assets |  |
Investment Grade Corporate Bond Funds [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Debt Securities [Member] |  |
Total pension plan assets |  |
Over 15y Gilts Index Fund [Member] | Debt Securities [Member] |  |
Total pension plan assets | 3,684 | 3,265
Over 15y Gilts Index Fund [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member] |  |
Total pension plan assets |  |
Over 15y Gilts Index Fund [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] |  |
Total pension plan assets |  |
Over 15y Gilts Index Fund [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] |  |
Total pension plan assets |  |
Over 15y Gilts Index Fund [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Debt Securities [Member] |  |
Total pension plan assets | 3,684 | 3,265
Active Corp Bond Over 10 Yr Fund [Member] | Debt Securities [Member] |  |
Total pension plan assets | 6,835 | 5,902
Active Corp Bond Over 10 Yr Fund [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member] |  |
Total pension plan assets |  |
Active Corp Bond Over 10 Yr Fund [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] |  |
Total pension plan assets |  |
Active Corp Bond Over 10 Yr Fund [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] |  |
Total pension plan assets |  |
Active Corp Bond Over 10 Yr Fund [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Debt Securities [Member] |  |
Total pension plan assets | 6,835 | 5,902
Over 5y Index Linked Gilts Fund [Member] | Debt Securities [Member] |  |
Total pension plan assets | 12,049 | 10,724
Over 5y Index Linked Gilts Fund [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member] |  |
Total pension plan assets |  |
Over 5y Index Linked Gilts Fund [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] |  |
Total pension plan assets |  |
Over 5y Index Linked Gilts Fund [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] |  |
Total pension plan assets |  |
Over 5y Index Linked Gilts Fund [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Debt Securities [Member] |  |
Total pension plan assets | 12,049 | 10,724
Philippine Long Govt Securities [Member] | Debt Securities [Member] |  |
Total pension plan assets | 1,362 | 1,133
Philippine Long Govt Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member] |  |
Total pension plan assets | 1,362 | 1,133
Philippine Long Govt Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] |  |
Total pension plan assets |  |
Philippine Long Govt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] |  |
Total pension plan assets |  |
Philippine Long Govt Securities [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Debt Securities [Member] |  |
Total pension plan assets |  |
Philippine Long Corporate Bonds [Member] | Debt Securities [Member] |  |
Total pension plan assets | 723 | 751
Philippine Long Corporate Bonds [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member] |  |
Total pension plan assets | 723 | 751
Philippine Long Corporate Bonds [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] |  |
Total pension plan assets |  |
Philippine Long Corporate Bonds [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] |  |
Total pension plan assets |  |
Philippine Long Corporate Bonds [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Debt Securities [Member] |  |
Total pension plan assets |  |

X
- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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