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Subsequent Events	3 Months Ended
	Mar. 31, 2021
Subsequent Events [Abstract]
Subsequent Events	10.          Subsequent Events Dividends on 6% Preferred Stock On March 10, 2021, the board of directors declared a quarterly cash dividend in the amount of $0.15 per share on the Company’s 6% Preferred Stock. The cash dividend was paid on May 1, 2021 to the holders of record of the 6% Preferred Stock as of the close of business on April 16, 2021. Assignation of Lease relating to facility in Dundee, Scotland On May 4, 2021, the Company assigned the operating lease relating to its facility in Dundee, Scotland to the University of Dundee. As part of the assignation, a reverse premium of approximately $400,000 was payable by the Company to the University of Dundee. Following assignation, the Company has no further obligations, liabilities or commitments in relation to this facility.

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- Definition

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-URI http://asc.fasb.org/topic&trid=2122774

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662

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