Note 11 - CFL Transaction (Details Textual) - USD ($)			1 Months Ended			12 Months Ended
Note 11 - CFL Transaction (Details Textual) - USD ($)	Oct. 30, 2021	Sep. 22, 2021	Dec. 31, 2023	Mar. 31, 2023	Jan. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Nov. 28, 2022	Aug. 12, 2016
Common Stock, Par or Stated Value Per Share (in dollars per share)			$ 0.01			$ 0.01	$ 0.01	$ 0.01
Stock Issued During Period, Shares, New Issues (in shares)			273,341	333,181	99,339
Shares Issued, Price Per Share (in dollars per share)			$ 1.7	$ 2.1		$ 1.7
Proceeds from Issuance of Common Stock			$ 464,300	$ 700,000		$ 3,364,300	$ 1,000,000
C F L [Member]
Percentage of Common Stock Held By Investors			23.50%			23.50%
Common Stock, Shares, Held by Investors (in shares)			2,692,271			2,692,271
CFL Transactions [Member]
Common Stock, Par or Stated Value Per Share (in dollars per share)									$ 0.01
Percentage of Common Stock Held By Investors									51.00%
Stock Issued During Period, Shares, New Issues (in shares)	375,869	474,384	122,670
Shares Issued, Price Per Share (in dollars per share)		$ 2.1	$ 1.63			$ 1.63
Proceeds from Issuance of Common Stock		$ 1,000,000	$ 200,000