Note 13 - Segments - Segments (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Revenue	$ 345,686	$ 676,626	$ 1,012,232	$ 1,308,102
Assets	7,420,508		7,420,508		$ 13,435,335
Depreciation and amortization	(39,796)	(42,706)	(122,019)	(206,901)
Segment loss	(2,283,413)	(2,748,367)	(8,759,343)	(9,025,398)
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Revenue	0	0	0	0
Assets	3,352,512		3,352,512		8,782,034
Depreciation and amortization	(1,682)	(1,851)	(5,352)	(5,528)
Segment loss	(1,076,507)	(1,884,384)	(4,890,238)	(4,840,639)
Pittsburgh [Member] | Operating Segments [Member]
Revenue	3,907	417,096	76,020	441,567
Assets	2,797,545		2,797,545		3,263,270
Depreciation and amortization	(30,766)	(31,946)	(94,272)	(175,713)
Segment loss	(1,053,373)	(674,952)	(3,260,416)	(3,428,644)
Eagan [Member] | Operating Segments [Member]
Revenue	341,779	259,530	936,212	866,535
Assets	1,270,451		1,270,451		$ 1,390,031
Depreciation and amortization	(7,348)	(8,909)	(22,395)	(25,660)
Segment loss	$ (153,533)	$ (189,031)	$ (608,689)	$ (756,115)