Note 7 - Fair Value of Assets and Liabilities - Schedule of Marketable Securities at Fair Value (Details) - USD ($)		Dec. 31, 2019	Dec. 31, 2018
Fair Value		$ 10,072,358	$ 8,915,238
Alluvial Fund, LP [Member]
Fair Value		10,072,358	8,446,488
Huckleberry Real Estate Fund II, LLC [Member]
Fair Value			468,750
Fair Value, Inputs, Level 1 [Member]
Fair Value
Fair Value, Inputs, Level 1 [Member] | Alluvial Fund, LP [Member]
Fair Value
Fair Value, Inputs, Level 1 [Member] | Huckleberry Real Estate Fund II, LLC [Member]
Fair Value
Fair Value, Inputs, Level 2 [Member]
Fair Value
Fair Value, Inputs, Level 2 [Member] | Alluvial Fund, LP [Member]
Fair Value
Fair Value, Inputs, Level 2 [Member] | Huckleberry Real Estate Fund II, LLC [Member]
Fair Value
Fair Value, Inputs, Level 3 [Member]
Fair Value			468,750
Fair Value, Inputs, Level 3 [Member] | Alluvial Fund, LP [Member]
Fair Value
Fair Value, Inputs, Level 3 [Member] | Huckleberry Real Estate Fund II, LLC [Member]
Fair Value			468,750
Fair Value Measured at Net Asset Value Per Share [Member]
Fair Value	[1]	10,072,358	8,446,488
Fair Value Measured at Net Asset Value Per Share [Member] | Alluvial Fund, LP [Member]
Fair Value	[1]	$ 10,072,358	8,446,488
Fair Value Measured at Net Asset Value Per Share [Member] | Huckleberry Real Estate Fund II, LLC [Member]
Fair Value	[1]

[1] Certain investments that are measured at fair value using the NAV per share (or its equivalent) as a practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheets.