Note 9 - Stockholders' Equity (Details Textual) - $ / shares	Jun. 30, 2022	Dec. 31, 2021
Common Stock, Shares Authorized (in shares)	150,000,000	150,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.0001	$ 0.0001
Preferred Stock, Shares Authorized (in shares)	5,000,000	5,000,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.0001	$ 0.0001
Class of Warrant or Right, Outstanding (in shares)	0	1,391,667