Finance Receivables - Assessment of credit quality by creditworthiness (Details 2) - Finance receivables - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020
Accounts Notes And Loans Receivable [Line Items]
Total	$ 184,104	$ 219,091
Finance receivables	184,237	219,366
Direct Loans
Accounts Notes And Loans Receivable [Line Items]
Total	13,909	11,844
Finance receivables	13,919	11,845
Performing accounts
Accounts Notes And Loans Receivable [Line Items]
Total	180,545	212,694
Performing accounts | Direct Loans
Accounts Notes And Loans Receivable [Line Items]
Total	13,717	11,649
Non-performing accounts
Accounts Notes And Loans Receivable [Line Items]
Total	3,559	6,397
Non-performing accounts | Direct Loans
Accounts Notes And Loans Receivable [Line Items]
Total	192	195
Chapter 13 bankruptcy
Accounts Notes And Loans Receivable [Line Items]
Finance receivables	133	275
Chapter 13 bankruptcy | Direct Loans
Accounts Notes And Loans Receivable [Line Items]
Finance receivables	10	1
Contract Portfolio
Accounts Notes And Loans Receivable [Line Items]
Total	170,195	207,247
Finance receivables	170,318	207,521
Contract Portfolio | Performing accounts
Accounts Notes And Loans Receivable [Line Items]
Total	166,828	201,045
Contract Portfolio | Non-performing accounts
Accounts Notes And Loans Receivable [Line Items]
Total	3,367	6,202
Contract Portfolio | Chapter 13 bankruptcy
Accounts Notes And Loans Receivable [Line Items]
Finance receivables	$ 123	$ 274