Quarterly report pursuant to Section 13 or 15(d)

Note 2 - Operations and Management Plans (Details Textual)

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Note 2 - Operations and Management Plans (Details Textual) - USD ($)
 1 Months Ended 3 Months Ended 4 Months Ended 6 Months Ended
Apr. 28, 2022
May 31, 2022
Mar. 31, 2022
Feb. 28, 2022
Jul. 31, 2021
May 31, 2022
May 31, 2021
May 31, 2022
May 31, 2022
May 31, 2021
Feb. 15, 2022
Nov. 30, 2021
Retained Earnings (Accumulated Deficit), Total   $ (59,715,000)       $ (59,715,000)   $ (59,715,000) $ (59,715,000)     $ (53,498,000)
Revenue from Contract with Customer, Excluding Assessed Tax           11,619,000 $ 13,401,000   19,596,000 $ 22,294,000    
Net Income (Loss) Available to Common Stockholders, Basic, Total           (2,996,000) $ 994,000   (6,217,000) $ 722,000    
Stock Issued During Period, Shares, New Issues (in shares)         2,875,000              
Shares Issued, Price Per Share (in dollars per share)         $ 21.00              
Stock Offering, Underwriting Discounts, Commissions, and Offering Expenses         $ 4,400,000              
Proceeds from Issuance of Common Stock, Net         $ 56,000,000.0              
Treasury Stock, Value, Acquired, Cost Method   4,999,993 $ 7,346,422 $ 2,653,571   $ 12,346,000   $ 14,999,986 $ 15,000,000      
Stock Buyback Plan [Member]                        
Stock Repurchase Program, Authorized Amount                     $ 10,000,000  
Stock Repurchase Program, Authorized Amount, Addition $ 5,000,000                      
Treasury Stock, Value, Acquired, Cost Method   $ 5,000,000 $ 10,000,000                  
Over-Allotment Option [Member]                        
Stock Issued During Period, Shares, New Issues (in shares)         375,000