Note 8 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Revenues	$ 3,169,233	$ 3,112,165	$ 6,073,691	$ 6,201,700
Percent of total revenues	100.00%	100.00%	100.00%	100.00%
Theranostics Products [Member]
Revenues	$ 2,169,131	$ 1,736,043
Percent of total revenues	68.00%	56.00%
Radiochemical Products [Member]
Revenues			$ 4,074,213	$ 3,498,439
Percent of total revenues			67.00%	56.00%
Cobalt Products [Member]
Revenues	$ 592,199	$ 448,258	$ 826,167	$ 606,566
Percent of total revenues	19.00%	14.00%	14.00%	10.00%
Nuclear Medicine Products [Member]
Revenues	$ 407,903	$ 927,864	$ 1,173,311	$ 2,096,695
Percent of total revenues	13.00%	30.00%	19.00%	34.00%
Medical Device Products [Member]
Revenues	$ 0	$ 0	$ 0	$ 0
Percent of total revenues	0.00%	0.00%	0.00%	0.00%
Fluorine Products [Member]
Revenues	$ 0	$ 0	$ 0	$ 0
Percent of total revenues	0.00%	0.00%	0.00%	0.00%
UNITED STATES
Revenues	$ 2,849,531	$ 2,733,232	$ 5,220,854	$ 5,372,094
UNITED STATES | Theranostics Products [Member]
Revenues	2,030,018	1,605,313
UNITED STATES | Radiochemical Products [Member]
Revenues			3,650,544	3,230,429
UNITED STATES | Cobalt Products [Member]
Revenues	588,599	395,395	803,967	537,553
UNITED STATES | Nuclear Medicine Products [Member]
Revenues	230,914	732,524	766,343	1,604,112
UNITED STATES | Medical Device Products [Member]
Revenues	0	0	0	0
UNITED STATES | Fluorine Products [Member]
Revenues	0	0	0	0
Non-US [Member]
Revenues	319,702	378,933	852,837	829,606
Non-US [Member] | Theranostics Products [Member]
Revenues	139,113	130,730
Non-US [Member] | Radiochemical Products [Member]
Revenues			423,669	268,010
Non-US [Member] | Cobalt Products [Member]
Revenues	3,600	52,863	22,200	69,013
Non-US [Member] | Nuclear Medicine Products [Member]
Revenues	176,989	195,340	406,968	492,583
Non-US [Member] | Medical Device Products [Member]
Revenues	0	0	0	0
Non-US [Member] | Fluorine Products [Member]
Revenues	$ 0	$ 0	$ 0	$ 0