Note 11 - Segment Information - Schedule of Segment Information by Segment (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Sale of product	$ 3,112,165	$ 2,434,808	$ 6,201,700	$ 5,242,249
Depreciation and amortization	88,130	84,433	175,398	203,551
Net income (loss)	(263,302)	(272,048)	(411,356)	982,997
Expenditures for segment assets	14,320	4,100	66,522	55,200
Segment assets	15,837,276		15,837,276		$ 16,244,596
Radiochemical Products [Member]
Sale of product	1,736,043	1,380,039	3,498,439	3,005,962
Cobalt Products [Member]
Sale of product	448,258	99,146	606,566	271,052
Nuclear Medicine Products [Member]
Sale of product	927,864	955,623	2,096,695	1,965,235
Fluorine Products [Member]
Sale of product	0	0	0	0
Operating Segments [Member]
Sale of product	3,112,165	2,434,808	6,201,700	5,242,249
Depreciation and amortization	77,677	74,237	155,849	183,049
Net income (loss)	758,928	394,811	1,599,341	2,858,285
Expenditures for segment assets	6,165	4,100	9,295	55,200
Segment assets	8,856,164		8,856,164		9,373,600
Operating Segments [Member] | Radiochemical Products [Member]
Sale of product	1,736,043	1,380,039	3,498,439	3,005,962
Depreciation and amortization	6,665	7,415	13,824	49,345
Net income (loss)	717,455	505,630	1,484,567	2,976,293
Expenditures for segment assets	0	0	0	0
Segment assets	837,771		837,771		1,075,252
Operating Segments [Member] | Cobalt Products [Member]
Sale of product	448,258	99,146	606,566	271,052
Depreciation and amortization	13,142	12,140	25,976	24,281
Net income (loss)	53,640	(42,332)	27,395	(55,407)
Expenditures for segment assets	6,165	0	6,165	0
Segment assets	324,755		324,755		406,629
Operating Segments [Member] | Nuclear Medicine Products [Member]
Sale of product	927,864	955,623	2,096,695	1,965,235
Depreciation and amortization	28,900	28,587	58,109	57,233
Net income (loss)	9,728	(26,144)	138,513	11,572
Expenditures for segment assets	0	0	3,130	51,100
Segment assets	2,661,330		2,661,330		2,744,394
Operating Segments [Member] | Fluorine Products [Member]
Sale of product	0	0	0	0
Depreciation and amortization	28,970	26,095	57,940	52,190
Net income (loss)	(21,895)	(42,343)	(51,134)	(74,173)
Expenditures for segment assets	0	4,100	0	4,100
Segment assets	5,032,308		5,032,308		5,147,325
Segment Reconciling Items [Member]
Sale of product	0	0	0	0
Depreciation and amortization	10,453	10,196	19,549	20,502
Net income (loss)	(1,022,230)	(666,859)	(2,010,697)	(1,875,288)
Expenditures for segment assets	8,155	$ 0	57,227	$ 0
Segment assets	$ 6,981,112		$ 6,981,112		$ 6,870,996