Note 11 - Rhode Island Acquisition - Pro Forma Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Revenues	$ 7,056,000	$ 5,568,000	$ 12,272,000	$ 10,493,000
Operating income	(1,000)	(325,000)	(86,000)	(227,000)
Revenue	7,056,000	5,568,000	12,272,000	10,493,000
Operating income	$ (1,000)	$ (325,000)	$ (86,000)	$ (227,000)
Diluted earnings per share (in dollars per share)	$ 0.55	$ (0.02)	$ 0.57	$ 0.01
Southern New England Regional Cancer Center, LLC and Roger Williams Radiation Therapy, LLC [Member]
Revenues	$ 1,892,000		$ 13,396,000
Operating income	612,000		1,045,000
Revenue	1,892,000		13,396,000
Operating income	$ 612,000		$ 1,045,000
Diluted earnings per share (in dollars per share)			$ 0.21