Annual report pursuant to Section 13 and 15(d)

Note 8 - Stock-based Compensation - Valuation Assumptions of Stock Options (Details)

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Note 8 - Stock-based Compensation - Valuation Assumptions of Stock Options (Details) - Black Scholes Weighted Average Assumptions [Member] - Employee Stock Option [Member] - $ / shares
12 Months Ended
Dec. 30, 2018
Dec. 31, 2017
Jan. 01, 2017
Expected dividend yield 0.00% 0.00%
Expected volatility 42.10% 43.80%
Expected forfeiture 30.00% 29.00%
Risk-free interest rate 2.84% 1.33%
Expected stock option life in years (Year) 4 years 4 years
Weighted-average stock option fair value per stock option granted (in dollars per share) $ 1 $ 0.48