Note 4 - Consumer Receivables Acquired for Liquidation (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2007
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Sep. 30, 2019
Face Value of Charged-off Consumer Receivables   $ 0   $ 0 $ 0 $ 0  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net   $ 1,193,000     $ 1,193,000   $ 1,668,000
Foreign Consumer Receivables, Percentage of Total Consumer Receivable   81.70%     81.70%   83.80%
Percentage of Assets Related to Internationl Operation   1.10%     1.10%   1.50%
Percentage of Revenue Related to International Operation   5.50%   4.90% 5.90% 4.90%  
Fee Charged on Portfolio Purchase 3.00%            
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Consumer Portfolio 1 [Member]              
Concentration Risk, Percentage   26.30%         23.90%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Consumer Portfolio 2 [Member]              
Concentration Risk, Percentage   18.30%         16.20%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Consumer Portfolio 3 [Member]              
Concentration Risk, Percentage   14.50%         14.10%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer Receivable Portfolio 4 [Member]              
Concentration Risk, Percentage             11.00%
Supplier Concentration Risk [Member] | Consumer Receivable Portfolio [Member] | Five Collection Organizations [Member]              
Concentration Risk, Percentage         34.00%   28.00%
Supplier Concentration Risk [Member] | Consumer Receivable Portfolio at All Third Party Collection Agencies and Attorneys [Member] | Five Collection Organizations [Member]              
Concentration Risk, Percentage     86.00%   89.00%    
PERU              
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net   $ 800,000     $ 800,000   $ 1,100,000
COLOMBIA              
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net   200,000     200,000   300,000
Non-US [Member]              
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net   $ 1,000,000     $ 1,000,000   $ 1,400,000