Note 4 - Subordinated Notes Receivable - Reconciliation of the Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Impairment	$ (701,000)	$ (833,000)
Second A&R Note [Member]
Principal	3,271,000	3,329,000
Discount, balance	(1,388,000)	(659,000)
Balance	1,883,000	2,670,000
Principal payments, principal	(190,000)	(58,000)
Principal payments	190,000	(58,000)
Accretion of discount, discount	0	104,000
Accretion of discount	0	104,000
Impairment, discount	(701)	(833)
Impairment	(701)	(833)
Principal payments	(190,000)	58,000
Principal	3,081,000	3,271,000
Discount, balance	(2,089,000)	(1,388,000)
Balance	$ 992,000	$ 1,883,000