Note 10 - Segment Information - Schedule of Segment Information by Segment (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Sale of product	$ 3,277,816	$ 3,924,444	$ 10,172,036	$ 9,998,135
Depreciation and amortization	100,718	100,789	299,698	301,211
Net loss	(203,601)	150,251	(477,080)	(237,245)
Expenditures for segment assets	64,017	44,015	254,391	267,307
Segment assets	17,846,637		17,846,637		$ 17,160,968
Operating Segments [Member]
Sale of product	3,277,816	3,924,444	10,172,036	9,998,135
Depreciation and amortization	83,898	72,248	247,914	233,764
Net loss	593,653	1,083,434	2,058,716	2,815,829
Expenditures for segment assets	64,017	39,799	231,952	235,132
Segment assets	10,216,907		10,216,907		9,518,063
Operating Segments [Member] | Theranostics Products [Member]
Sale of product	1,484,284	2,183,197	5,176,740	6,257,410
Depreciation and amortization	9,962	7,785	28,066	22,528
Net loss	634,625	1,289,266	2,521,006	3,474,120
Expenditures for segment assets	0	0	50,561	146,295
Segment assets	1,285,118		1,285,118		992,513
Operating Segments [Member] | Cobalt Products [Member]
Sale of product	766,682	814,845	1,517,147	1,641,012
Depreciation and amortization	16,360	13,689	48,722	41,103
Net loss	245,837	(51,805)	571	(18,806)
Expenditures for segment assets	0	39,799	12,835	39,799
Segment assets	724,834		724,834		167,881
Operating Segments [Member] | Calibration & Reference Products [Member]
Sale of product	961,093	926,402	3,301,673	2,099,713
Depreciation and amortization	31,481	30,429	92,841	91,848
Net loss	(99,118)	39,519	130,058	(328,743)
Expenditures for segment assets	0	0	75,663	49,038
Segment assets	2,709,918		2,709,918		2,928,814
Operating Segments [Member] | Medical Device Products [Member]
Sale of product	65,757	0	176,476	0
Depreciation and amortization	0	0	0	0
Net loss	(187,615)	(167,451)	(570,589)	(279,801)
Expenditures for segment assets	64,017	0	92,893	0
Segment assets	699,583		699,583		553,117
Operating Segments [Member] | Fluorine Products [Member]
Sale of product	0	0	0	0
Depreciation and amortization	26,095	20,345	78,285	78,285
Net loss	(76)	(26,095)	(22,330)	(30,941)
Expenditures for segment assets	0	0	0	0
Segment assets	4,797,454		4,797,454		4,875,738
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Sale of product	0	0	0	0
Depreciation and amortization	16,820	28,541	51,784	67,447
Net loss	(797,254)	(933,183)	(2,535,796)	(3,053,074)
Expenditures for segment assets	0	$ 4,216	22,439	$ 32,175
Segment assets	$ 7,629,730		$ 7,629,730		$ 7,642,905