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| 0000945764-22-000056.txt | 2022-05-06 09:01:40 | |
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| den-20220331.htm | 1220828 | 2022-05-06 09:01:40 |
| 3700483 | 2022-05-06 09:01:40 | |
| den-20220331.xsd | 28704 | 2022-05-06 09:01:40 |
| den-20220331xex10a.htm | 46339 | 2022-05-06 09:01:40 |
| den-20220331xex10b.htm | 38897 | 2022-05-06 09:01:40 |
| den-20220331xex10c.htm | 123792 | 2022-05-06 09:01:40 |
| den-20220331xex10d.htm | 1877180 | 2022-05-06 09:01:40 |
| den-20220331xex31a.htm | 10863 | 2022-05-06 09:01:40 |
| den-20220331xex31b.htm | 10883 | 2022-05-06 09:01:40 |
| den-20220331xex32.htm | 7831 | 2022-05-06 09:01:40 |
| den-20220331_cal.xml | 56783 | 2022-05-06 09:01:40 |
| den-20220331_def.xml | 116011 | 2022-05-06 09:01:40 |
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| den-20220331_htm.xml | 644677 | 2022-05-06 09:01:40 |
| den-20220331_lab.xml | 400191 | 2022-05-06 09:01:40 |
| den-20220331_pre.xml | 243622 | 2022-05-06 09:01:40 |
| FilingSummary.xml | 24010 | 2022-05-06 09:01:40 |
| Financial_Report.xlsx | 58584 | 2022-05-06 09:01:40 |
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| R9.htm | 14891 | 2022-05-06 09:01:40 |
| report.css | 2767 | 2022-05-06 09:01:40 |
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 tsra.jpg | 40670 | 2022-05-06 09:01:40 |