Note 5 - Stockholders' Equity (Details Textual) - $ / shares	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Common Stock, Shares Authorized (in shares)	300,000,000	300,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.01	$ 0.01
Series C Preferred Stock [Member]
Preferred stock, shares issued (in shares)			317,420
Series C convertible preferred stock, shares outstanding (in shares)			11,674,131
Series A 4.5% Convertible Preferred Stock [Member]
Preferred Stock, Par or Stated Value Per Share (in dollars per share)		$ 0.01
Series A 4.5% Convertible Preferred Stock [Member] | Private Placement [Member]
Convertible Preferred Stock, Issuable Upon Conversion of All Shares (in shares)	6,479
Series A Preferred Stock [Member]
Preferred Stock, Shares Authorized (in shares)	7,000,000	7,000,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares issued (in shares)	200,000
LBS [Member]
Common Stock, Shares Authorized (in shares)			6,797,500
Common Stock, Par or Stated Value Per Share (in dollars per share)			$ 0.01
Preferred Stock, Shares Authorized (in shares)			33,594,625
Preferred Stock, Par or Stated Value Per Share (in dollars per share)			$ 0.001