Note 9 - Segments - Segments (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Revenue	$ 239,895	$ 314,568
Net loss	(3,421,802)	(3,370,715)
Assets	25,061,579	25,734,644	$ 25,734,644
Operating Segments [Member] | Pittsburgh [Member]
Revenue	10,627	21,980
Net loss	(1,159,105)	(1,314,513)
Assets	3,746,088	1,055,228
Operating Segments [Member] | Eagan [Member]
Revenue	215,619	279,270
Net loss	(285,397)	(48,602)
Assets	1,125,840	946,394
Operating Segments [Member] | Birmingham [Member]
Revenue	13,649	12,916
Net loss	(482,696)	(402,828)
Assets	1,441,002	1,353,434
Corporate, Non-Segment [Member]
Revenue	0	402
Net loss	(1,494,604)	(1,604,772)
Assets	$ 18,748,649	$ 22,379,588