Note 11 - Rhode Island Acquisition - Major Classes of Assets and Liabilities (Details) - USD ($)				3 Months Ended			5 Months Ended	9 Months Ended
	Sep. 30, 2024	May 07, 2024	Nov. 10, 2023	Sep. 30, 2024	Jun. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Cash and cash equivalents	$ 13,827,000			$ 13,827,000		$ 14,537,000	$ 13,827,000	$ 13,827,000	$ 14,537,000	$ 13,690,000
Operating Lease, Right-of-Use Asset	986,000			986,000			986,000	986,000		57,000
Total assets acquired	63,269,000			63,269,000			63,269,000	63,269,000		48,162,000
Lease liabilities	(1,735,000)			(1,735,000)			(1,735,000)	(1,735,000)
Deferred income taxes	(1,560,000)			(1,560,000)			(1,560,000)	(1,560,000)		(63,000)
Gain on bargain purchase				(263,000)		$ 0		(3,942,000)	0
Base purchase consideration	31,439,000			31,439,000			31,439,000	31,439,000		$ 21,883,000
Non-controlling interest				(200,000)	$ (2,100,000)			(1,900,000)	0
CT Sim								(3,278,000)	$ (6,176,000)
Southern New England Regional Cancer Center, LLC and Roger Williams Radiation Therapy, LLC [Member]
Cash and cash equivalents	3,388,000	$ 3,388,000		3,388,000			3,388,000	3,388,000
Accounts Receivable, after Allowance for Credit Loss	619,000	919,000		619,000			619,000	619,000
Property, plant, and equipment	7,100,000			7,100,000			7,100,000	7,100,000
Operating Lease, Right-of-Use Asset	1,835,000	1,835,000		1,835,000			1,835,000	1,835,000
Unfavorable leasehold interests	(776,000)	(1,227,000)
Total assets acquired	12,166,000	12,015,000		12,166,000			12,166,000	12,166,000
Accounts payable	(150,000)	(150,000)		(150,000)			(150,000)	(150,000)
Lease liabilities	(1,835,000)	(1,835,000)		(1,835,000)			(1,835,000)	(1,835,000)
Deferred income taxes	(1,314,000)	(1,226,000)		(1,314,000)			(1,314,000)	(1,314,000)
Gain on bargain purchase	(3,942,000)	(3,679,000)		(263,000)				(3,942,000)
Base purchase consideration	4,925,000	5,125,000		4,925,000			4,925,000	4,925,000
Non-controlling interest	(1,900,000)	(2,100,000)
CT Sim	(175,000)	(175,000)
Business Combination, Consideration Transferred	2,850,000	2,850,000	$ 2,850,000
Southern New England Regional Cancer Center, LLC and Roger Williams Radiation Therapy, LLC [Member] | Medical Equipment [Member]
Property, plant, and equipment	2,403,000	2,403,000		2,403,000			2,403,000	2,403,000
Southern New England Regional Cancer Center, LLC and Roger Williams Radiation Therapy, LLC [Member] | Medical Facilities [Member]
Property, plant, and equipment	4,697,000	$ 4,697,000		4,697,000			4,697,000	4,697,000
Southern New England Regional Cancer Center, LLC and Roger Williams Radiation Therapy, LLC [Member] | Changes Measurement [Member]
Cash and cash equivalents	0			0			0	0
Accounts Receivable, after Allowance for Credit Loss	(300,000)			(300,000)			(300,000)	(300,000)
Operating Lease, Right-of-Use Asset	0			0			0	0
Unfavorable leasehold interests							451,000
Total assets acquired	151,000			151,000			151,000	151,000
Accounts payable	0			0			0	0
Lease liabilities	0			0			0	0
Deferred income taxes	(88,000)			(88,000)			(88,000)	(88,000)
Gain on bargain purchase							(263,000)
Base purchase consideration	(200,000)			(200,000)			(200,000)	(200,000)
Non-controlling interest							200,000
CT Sim							0
Business Combination, Consideration Transferred							0
Southern New England Regional Cancer Center, LLC and Roger Williams Radiation Therapy, LLC [Member] | Changes Measurement [Member] | Medical Equipment [Member]
Property, plant, and equipment	0			0			0	0
Southern New England Regional Cancer Center, LLC and Roger Williams Radiation Therapy, LLC [Member] | Changes Measurement [Member] | Medical Facilities [Member]
Property, plant, and equipment	$ 0			$ 0			$ 0	$ 0