Note 15 - Segment Information - Schedule of Segment Information by Segment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Sale of product	$ 12,267,385	$ 11,181,988
Depreciation and amortization	350,094	374,196
Net income (loss)	(869,016)	303,238
Expenditures for segment assets	149,058	120,014
Segment assets	16,905,087	16,244,596
Theranostics Products [Member]
Sale of product	6,842,898	6,045,767
Cobalt Products [Member]
Sale of product	1,037,073	1,157,536
Nuclear Medicine Products [Member]
Sale of product	4,387,414	3,978,685
Fluorine Products [Member]
Sale of product	0	0
Operating Segments [Member]
Sale of product	12,267,385	11,181,988
Depreciation and amortization	309,330	343,283
Net income (loss)	3,192,364	3,985,735
Expenditures for segment assets	88,331	100,062
Segment assets	9,642,540	9,373,600
Operating Segments [Member] | Theranostics Products [Member]
Sale of product	6,842,898	6,045,767
Depreciation and amortization	25,287	63,493
Net income (loss)	3,037,375	4,182,151
Expenditures for segment assets	3,420	3,379
Segment assets	849,351	1,075,252
Operating Segments [Member] | Cobalt Products [Member]
Sale of product	1,037,073	1,157,536
Depreciation and amortization	53,331	49,202
Net income (loss)	(126,504)	(95,779)
Expenditures for segment assets	49,774	17,105
Segment assets	274,513	406,629
Operating Segments [Member] | Nuclear Medicine Products [Member]
Sale of product	4,387,414	3,978,685
Depreciation and amortization	114,833	114,990
Net income (loss)	386,592	39,223
Expenditures for segment assets	35,137	75,478
Segment assets	3,538,558	2,744,394
Operating Segments [Member] | Fluorine Products [Member]
Sale of product	0	0
Depreciation and amortization	115,879	115,598
Net income (loss)	(105,099)	(139,860)
Expenditures for segment assets	0	4,100
Segment assets	4,980,118	5,147,325
Corporate, Non-Segment [Member]
Sale of product	0	0
Depreciation and amortization	40,764	30,913
Net income (loss)	(4,061,380)	(3,682,497)
Expenditures for segment assets	60,727	19,952
Segment assets	$ 7,262,547	$ 6,870,996