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Note 6 - Stockholder's Equity (Details Textual) - $ / shares
12 Months Ended
Jan. 09, 2020
Dec. 05, 2019
Oct. 08, 2019
Sep. 05, 2019
Jul. 10, 2019
Jun. 05, 2019
Apr. 18, 2019
Mar. 13, 2019
Feb. 22, 2019
Jan. 11, 2019
Dec. 06, 2018
Oct. 02, 2018
Sep. 04, 2018
Jul. 06, 2018
Jun. 04, 2018
Apr. 13, 2018
Mar. 07, 2018
May 22, 2017
Aug. 18, 2015
May 06, 2013
Nov. 30, 2019
Nov. 30, 2018
Common Stock, Dividends, Per Share, Declared                                         $ 0.05 $ 0.05
Preferred Stock Dividends Number of Rights Declared                                       1    
Preferred Stock Dividends Number of Rights Minimum Percent of Common Stock that must be Acquired to Make Rights Exercisable                                       15.00%    
Preferred Stock Dividends Number of Rights Minimum Percent of Common Stock that Must be Acquired to Make Rights Exercisable, Institutional Investors                                       20.00%    
Right to Purchase Series A Preferred Stock [Member]                                            
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right                                       0.001    
Class of Warrant or Right, Exercise Price of Warrants or Rights                                       $ 0.90    
Class of Warrant or Right, Term                 9 years                 7 years 5 years      
Quarterly Dividend [Member]                                            
Common Stock, Dividends, Per Share, Declared       $ 0.01   $ 0.01   $ 0.01     $ 0.01   $ 0.01   $ 0.01   $ 0.01          
Common Stock, Dividends, Per Share, Cash Paid     $ 0.01   $ 0.01   $ 0.01     $ 0.01   $ 0.01   $ 0.01   $ 0.01            
Quarterly Dividend [Member] | Subsequent Event [Member]                                            
Common Stock, Dividends, Per Share, Declared   $ 0.01                                        
Common Stock, Dividends, Per Share, Cash Paid $ 0.01                                          
Special Cash Distribution [Member]                                            
Common Stock, Dividends, Per Share, Declared                     $ 0.02                      
Common Stock, Dividends, Per Share, Cash Paid                   $ 0.02                        
Special Cash Distribution [Member] | Subsequent Event [Member]                                            
Common Stock, Dividends, Per Share, Declared   $ 0.02                                        
Common Stock, Dividends, Per Share, Cash Paid $ 0.02