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Accounts Receivable and Credit Losses (Credit Quality Analysis of Financing Receivable) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 49,831	$ 50,025	$ 47,673
Institutional Loans, Past Due		24,276	16,146
Institutional Loans, Current		25,749	31,527
Total Institutional Loans	49,831	50,025	47,673
Financing Receivables 1 To 30 Days Past Due [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Prior	1,117
2017	1,338
2018	647
2019	889
2020	379
2021	24
Total	4,394
Institutional Loans, Past Due		7,192	3,317
Total Institutional Loans	4,394
Financing Receivables 31 To 60Days Past Due [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Prior	556
2017	145
2018	41
2019	67
2020	223
Total	1,032
Institutional Loans, Past Due		1,755	1,342
Total Institutional Loans	1,032
Financing Receivables 61 To 90 Days Past Due [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Prior	609
2017	59
2018	444
2019	71
2020	127
Total	1,310
Institutional Loans, Past Due		1,547	526
Total Institutional Loans	1,310
Financing Receivables Greater Than 90 Days Past Due [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Prior	8,179
2017	3,156
2018	2,475
2019	1,132
2020	334
Total	15,276
Institutional Loans, Past Due		$ 13,782	$ 10,961
Total Institutional Loans	15,276
Financing Receivable Past Due [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Prior	10,461
2017	4,698
2018	3,607
2019	2,159
2020	1,063
2021	24
Total	22,012
Total Institutional Loans	22,012
Financing Receivable Current [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Prior	11,634
2017	4,994
2018	3,732
2019	4,682
2020	2,384
2021	393
Total	27,819
Total Institutional Loans	27,819
Financing Receivable Gross [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Prior	22,095
2017	9,692
2018	7,339
2019	6,841
2020	3,447
2021	417
Total	49,831
Total Institutional Loans	$ 49,831