Note 10 - Related Party Transactions (Details Textual) - USD ($)	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Director [Member]
Common Stock, Percentage of Beneficial Stock Outstanding			5.00%
BHS [Member] \| Royalty Agreement and License [Member]
Royalty Expense	$ 13,000	$ 8,000
Related Party Transaction, Automatic Renewal Period of Agreement (Year)	1 year
Number of Days Termination Notice (Day)	90 days

Amount of expense related to royalty payments under a contractual arrangement such as payment for mineral and drilling rights and use of technology or intellectual property.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
-URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227

Name:	us-gaap_RoyaltyExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration