Note 6 - Preferred Stock (Details Textual)	6 Months Ended
	Jun. 30, 2023 $ / shares shares	Dec. 31, 2022 $ / shares shares	Jan. 25, 2022 $ / shares shares
Preferred Stock, Shares Authorized (in shares)	3,000,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares	$ 0.01
Conversion of Series B Preferred Stock into Common Stock [Member]
Conversion of Stock, Shares Converted (in shares)	204,753
Conversion of Stock, Shares Issued (in shares)	307,130
Series B Preferred Stock [Member]
Preferred Stock, Shares Authorized (in shares)	2,000,000	2,000,000	2,000,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares	$ 0.01	$ 0.01	$ 0.01
Preferred Stock, Convertible, Conversion Ratio			1.5
Preferred Stock, Shares Outstanding (in shares)	721,420	854,753
Preferred Stock, Convertible, Shares Issuable (in shares)	975,000
Conversion of Series B Preferred Stock into Common Stock [Member]
Preferred Stock, Shares Outstanding (in shares)	650,000