Quarterly report pursuant to Section 13 or 15(d)

Note 17 - Subsequent Events (Details Textual)

v3.21.2
Note 17 - Subsequent Events (Details Textual) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended 10 Months Ended 12 Months Ended
Jul. 08, 2021
Aug. 31, 2020
Dec. 31, 2019
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Dec. 31, 2020
Stock Issued During Period, Shares, New Issues (in shares)     2,100,000              
Stock Issued During Period, Value, New Issues       $ 1,800,000   $ 700,000        
Proceeds from Issuance of Preferred Stock and Preference Stock             $ 10,475,000 $ 700,000    
Series D Preferred Stock [Member]                    
Stock Issued During Period, Value, New Issues         $ 250,001          
Preferred Stock, Shares Subscribed but Unissued, Subscriptions Receivable       (0)     (0)   $ (0) $ 10,300,000
Series D Preferred Stock [Member] | Stock Subscriptions and Other Receivables [Member]                    
Preferred Stock, Shares Subscribed but Unissued, Subscriptions Receivable       $ 2,200,000     $ 2,200,000   $ 2,200,000  
Keystone Capital Partners, LLC [Member] | Series D Preferred Stock [Member]                    
Stock Issued During Period, Shares, New Issues (in shares)   150,000             72,500  
Stock Issued During Period, Value, New Issues   $ 15,000,000.0                
Stock Purchase Agreement, Shares Remaining (in shares)       77,500     77,500   77,500  
Proceeds from Issuance of Preferred Stock and Preference Stock             $ 2,925,000     $ 2,925,000
Subsequent Event [Member] | Keystone Capital Partners, LLC [Member] | Series D Preferred Stock [Member]                    
Stock Issued During Period, Shares, New Issues (in shares) 22,077                  
Stock Issued During Period, Value, New Issues $ 2,200,000                  
Proceeds from Issuance of Preferred Stock and Preference Stock $ 2,200,000