Note 10 - Segment Information - Schedule of Segment Information by Segment (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Sale of product	$ 3,169,233	$ 3,112,165	$ 6,073,691	$ 6,201,700
Depreciation and amortization	98,975	88,130	200,422	175,398
Net income (loss)	(233,445)	(263,302)	(387,496)	(411,356)
Expenditures for segment assets	44,015	14,320	214,936	66,522
Segment assets	15,924,378		15,924,378		$ 16,905,087
Theranostics Products [Member]
Sale of product	2,169,131	1,736,043
Cobalt Products [Member]
Sale of product	592,199	448,258	826,167	606,566
Nuclear Medicine Products [Member]
Sale of product	407,903	927,864	1,173,311	2,096,695
Medical Device Products [Member]
Sale of product	0	0	0	0
Fluorine Products [Member]
Sale of product	0	0	0	0
Operating Segments [Member]
Sale of product	3,169,233	3,112,165	6,073,691	6,201,700
Depreciation and amortization	88,185	77,677	161,516	155,849
Net income (loss)	783,022	758,928	1,732,395	1,599,341
Expenditures for segment assets	39,799	6,165	182,761	9,295
Segment assets	9,092,704		9,092,704		9,642,540
Operating Segments [Member] | Theranostics Products [Member]
Sale of product	2,169,131	1,736,043	4,074,213	3,498,439
Depreciation and amortization	5,697	6,665	14,743	13,824
Net income (loss)	1,171,390	717,455	2,184,854	1,484,567
Expenditures for segment assets	0	0	93,924	0
Segment assets	929,131		929,131		849,351
Operating Segments [Member] | Cobalt Products [Member]
Sale of product	592,199	448,258	826,167	606,566
Depreciation and amortization	23,527	13,142	27,414	25,976
Net income (loss)	99,324	53,640	32,999	27,395
Expenditures for segment assets	39,799	6,165	39,799	6,165
Segment assets	265,543		265,543		274,513
Operating Segments [Member] | Nuclear Medicine Products [Member]
Sale of product	407,903	927,864	1,173,311	2,096,695
Depreciation and amortization	32,866	28,900	61,419	58,109
Net income (loss)	(377,758)	9,728	(368,262)	138,513
Expenditures for segment assets	0	0	49,038	3,130
Segment assets	2,418,002		2,418,002		2,986,458
Operating Segments [Member] | Medical Device Products [Member]
Sale of product	0	0	0	0
Depreciation and amortization	0	0	0	0
Net income (loss)	(83,839)	0	(112,350)	0
Expenditures for segment assets	0	0	0	0
Segment assets	552,100		552,100		552,100
Operating Segments [Member] | Fluorine Products [Member]
Sale of product	0	0	0	0
Depreciation and amortization	26,095	28,970	57,940	57,940
Net income (loss)	(26,095)	(21,895)	(4,846)	(51,134)
Expenditures for segment assets	0	0	0	0
Segment assets	4,927,928		4,927,928		4,980,118
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member]
Sale of product	0	0	0	0
Depreciation and amortization	10,790	10,453	38,906	19,549
Net income (loss)	(1,016,467)	(1,022,230)	(2,119,891)	(2,010,697)
Expenditures for segment assets	4,216	$ 8,155	32,175	$ 57,227
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Segment assets	$ 6,831,674		$ 6,831,674		$ 7,262,547