Note 15 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Carrying value differences	$ 232,030	$ 498,863
Net operating loss carryforward	2,927,848	1,333,361
Tax credits	6,250	6,250
Other
Subtotal	3,166,128	1,838,474
Valuation allowance	(2,732,064)	(1,539,716)
Net deferred tax assets	434,064	298,758
Net unrealized gains on appreciated investments	(434,064)	(298,758)
Net deferreds