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Note 18 - Stockholder Rights Plan (Details Textual) - $ / shares | Sep. 26, 2020 | May 22, 2020 | Dec. 28, 2019
--- | --- | --- | ---
Number of Units Called by Each Right (in shares) |  | 0.01 |
Preferred Stock, Shares Authorized (in shares) | 5,000,000 |  | 5,000,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ 1 |  | $ 1
Preferred Stock, Shares Issued, Total (in shares) | 0 |  | 0
Minimum Percent of Common Stock to be Purchased for Rights to Become Exercisable |  | 10.00% |
Preferred Stock, Shares Outstanding, Ending Balance (in shares) | 0 |  | 0
Series A-3 Junior Participating Preferred Shares [Member] |  |  |
Preferred Stock, Shares Authorized (in shares) |  | 250,000 |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) |  | $ 1 |
Preferred Stock, Shares Issued, Total (in shares) |  | 0 |
Preferred Stock, Redemption Price Per Share (in dollars per share) |  | $ 50 |
Preferred Stock, Redemption Price Multiplier |  | 100 |
Preferred Stock, Shares Outstanding, Ending Balance (in shares) |  | 0 |
Series A-3 Junior Participating Preferred Shares [Member] | Voluntary or Involuntary Liquidation, Dissolution or Winding up of the Company [Member] |  |  |
Preferred Stock, Redemption Price Per Share (in dollars per share) |  | $ 100 |
Preferred Stock, Redemption Price Multiplier |  | 100 |
Series A-3 Junior Participating Preferred Shares [Member] | Consolidation, Merger, Combination or Other Transaction in which Shares of Common Stock are Exchanged [Member] |  |  |
Preferred Stock, Redemption Price Multiplier |  | 100 |
Right [Member] |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) |  | 1 |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 5.60 |
Class of Warrant or Right, Price Per Right (in dollars per share) |  | $ 0.001 |

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- Definition The multiplier at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer. + References No definition available. + Details
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