Note 7 - Segment Information - Summary of Financial Information Concerning Company's Reportable Segments (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Aug. 11, 2022
Revenues									$ 7,638,511	$ 4,287,085
Cost of revenue									103,843	0
Operating expenses									6,429,750	2,792,222
Other income (expense)									1,085,989	15,223
Net income (loss)	$ 538,288	$ 319,795	$ 762,885	$ 761,617	$ 596,223	$ 402,233	$ 306,202	$ 205,428	2,382,585	1,510,086
Goodwill, Ending Balance	737,869				0				737,869	0	$ 737,869
Identifiable assets	21,471,495				4,053,827				21,471,495	4,053,827
Operating Segments [Member]
Revenues									7,638,511	4,287,085
Cost of revenue									103,843	0
Operating expenses									6,429,750	2,792,222
Other income (expense)									1,277,667	15,223
Net income (loss)									2,382,585	1,510,086
Goodwill, Ending Balance	737,869				0				737,869	0
Identifiable assets	20,733,626				4,053,827				20,733,626	4,053,827
Crossing Bridge Advisor LLC [Member]
Revenues									7,271,332	4,287,085
Goodwill, Ending Balance	737,869								737,869
Crossing Bridge Advisor LLC [Member] | Operating Segments [Member]
Revenues									7,271,332	4,287,085
Cost of revenue									0	0
Operating expenses									3,998,003	2,792,222
Other income (expense)									15,611	15,223
Net income (loss)									3,288,940	1,510,086
Goodwill, Ending Balance	737,869				0				737,869	0
Identifiable assets	955,625				4,053,827				955,625	4,053,827
Willow Oak Asset Management LLC [Member]
Revenues									61,499	0
Willow Oak Asset Management LLC [Member] | Operating Segments [Member]
Revenues									61,499	0
Cost of revenue									0	0
Operating expenses									172,865	0
Other income (expense)									(692)	0
Net income (loss)									(112,058)	0
Goodwill, Ending Balance	0				0				0	0
Identifiable assets	726,279				0				726,279	0
Internet Operations [Member]
Revenues									305,680	0
Cost of revenue									103,843	0
Internet Operations [Member] | Operating Segments [Member]
Revenues									305,680	0
Cost of revenue									103,843	0
Operating expenses									105,115	0
Other income (expense)									(398)	0
Net income (loss)									96,324	0
Goodwill, Ending Balance	0				0				0	0
Identifiable assets	905,395				0				905,395	0
Other Segments [Member] | Operating Segments [Member]
Revenues									0	0
Cost of revenue									0	0
Operating expenses									2,153,767	0
Other income (expense)									1,263,146	0
Net income (loss)									(890,621)	0
Goodwill, Ending Balance	0				0				0	0
Identifiable assets	$ 18,146,327				$ 0				$ 18,146,327	$ 0