XML 37 R27.htm IDEA: XBRL DOCUMENT
v3.21.1

Note 6 - Marketable Securities (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2021
Notes Tables |
Marketable Securities [Table Text Block] |
|  | As of March 31, 2021 |  |  | As of December 31, 2020 |
Marketable securities: |  |  |  |  |  |  |  |
Amortized cost |  | $ | 114,480 |  |  | $ | 114,531 |
Unrealized gains, net |  |  | 653,509 |  |  |  | 592,423 |
Total fair value |  | $ | 767,989 |  |  | $ | 706,954 |

X
- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References No definition available. + Details
Name: | us-gaap_MarketableSecuritiesTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_TableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration