Note 18 - Stockholder Rights Plan (Details Textual) - $ / shares	Jun. 27, 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