Note 18 - Stockholder Rights Plan (Details Textual) - $ / shares	May 22, 2020	Apr. 03, 2021	Jan. 02, 2021
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, Dividend Rate, Per-Dollar-Amount (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 Multiplier	100
Preferred Stock, Redemption Price Per Share (in dollars per share)	$ 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