Finance Receivables - Assessment of credit quality by creditworthiness (Details 3) - Finance receivables - USD ($) $ in Thousands	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Accounts Notes And Loans Receivable [Line Items]
Total	$ 176,025		$ 188,397
Finance receivables	176,173		188,626
Chapter 13 bankruptcy
Accounts Notes And Loans Receivable [Line Items]
Finance receivables	148		229
Direct Loans
Accounts Notes And Loans Receivable [Line Items]
Total	22,545	$ 13,909	14,227
Finance receivables	22,551		14,238
Direct Loans | Chapter 13 bankruptcy
Accounts Notes And Loans Receivable [Line Items]
Finance receivables	6		11
Performing accounts
Accounts Notes And Loans Receivable [Line Items]
Total	169,805		180,995
Performing accounts | Direct Loans
Accounts Notes And Loans Receivable [Line Items]
Total	22,216		13,925
Non-performing accounts
Accounts Notes And Loans Receivable [Line Items]
Total	6,220		7,402
Non-performing accounts | Direct Loans
Accounts Notes And Loans Receivable [Line Items]
Total	329		302
Contract Portfolio
Accounts Notes And Loans Receivable [Line Items]
Total	153,480	$ 170,195	174,170
Finance receivables	153,622		174,388
Contract Portfolio | Chapter 13 bankruptcy
Accounts Notes And Loans Receivable [Line Items]
Finance receivables	142		218
Contract Portfolio | Performing accounts
Accounts Notes And Loans Receivable [Line Items]
Total	147,589		167,070
Contract Portfolio | Non-performing accounts
Accounts Notes And Loans Receivable [Line Items]
Total	$ 5,891		$ 7,100