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Note 3 - Subordinated Notes Receivable (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Mar. 16, 2020
Mar. 13, 2020
Mar. 12, 2020
Mar. 04, 2020
Feb. 28, 2020
Jan. 31, 2020
Dec. 31, 2020
Mar. 31, 2020
Jun. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Mar. 06, 2020
Feb. 07, 2019
Dec. 31, 2018
Sep. 06, 2018
Mar. 31, 2018
Financing Receivable, after Allowance for Credit Loss, Total                               $ 7,400,000
Impairment of Notes Receivable                   $ 833,000 $ 897,000          
Accretion (Amortization) of Discounts and Premiums, Investments                   104,000 217,000          
A&R Note [Member]                                
Financing Receivable, before Allowance for Credit Loss, Total                             $ 3,300,000  
Second A&R Note [Member]                                
Financing Receivable, after Allowance for Credit Loss, Total               $ 1,300,000 709,000     $ 2,364,000    
Financing Receivable, before Allowance for Credit Loss, Total                 2,564,000   $ 3,200,000 $ 3,376,000    
Notes Receivable, Interest Rate                         6.00%      
Impairment of Notes Receivable                 $ 897,000   897,000          
Proceeds from Interest Received                   0            
Second A&R Note [Member] | Loan Parties [Member]                                
Proceeds from Collection of Finance Receivables $ 392,000 $ 750,000 $ 250,000 $ 350,000 $ 200,000 $ 130,000                    
Gain (Loss) on Payoff of Notes Receivable               $ 1,300,000                
Second Forbearance Extension Letter Agreement, Second A&R Note due March 12, 2020 [Member] | Loan Parties [Member]                                
Financing Receivable, before Allowance for Credit Loss, Total                       $ 250,000        
Second Forbearance Extension Letter Agreement, Second A&R Note due March 13, 2020 [Member] | Loan Parties [Member]                                
Financing Receivable, before Allowance for Credit Loss, Total                       750,000        
Second Forbearance Extension Letter Agreement, Second A&R Note due March 17, 2020 [Member] | Loan Parties [Member]                                
Financing Receivable, before Allowance for Credit Loss, Total                       $ 391,970        
S&L Note [Member]                                
Financing Receivable, after Allowance for Credit Loss, Total             1,900,000     1,900,000            
Financing Receivable, before Allowance for Credit Loss, Total                             $ 4,400,000  
Notes Receivable, Interest Rate                             10.00%  
Impairment of Notes Receivable                   833,000 0          
Proceeds from Collection of Finance Receivables                   58,000 1,011,000          
Proceeds from Interest Received             $ 58,000                  
Interest Paid, Excluding Capitalized Interest, Operating Activities                   252,000 356,000          
Accretion (Amortization) of Discounts and Premiums, Investments                   $ 104,000 $ 163,000