XML 30 R20.htm IDEA: XBRL DOCUMENT
v3.21.2

Stock-Based Compensation (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2021
Share-based Payment Arrangement [Abstract] |
Schedule of stock option plans |
|  | Number of Options Outstanding |  |  | Weighted Average Exercise Price |
Outstanding at January 1, 2021 |  |  | 10,500 |  |  | $ | 29.61 |
Expired |  |  | (1,000 | ) |  |  | 61.10 |
Outstanding at June 30, 2021 |  |  | 9,500 |  |  | $ | 26.19 |

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

X
- Definition Tabular disclosure of the change in stock options. + References No definition available. + Details
Name: | us-gaap_ScheduleOfStockOptionsRollForwardTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration