Note 6 - Equity Method Investments (Details Textual) - USD ($)		2 Months Ended	12 Months Ended
	Jan. 16, 2018	Mar. 31, 2018	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017	[1]	Jan. 15, 2018
Payments to Acquire Equity Method Investments			$ 263,492		$ 2,301,026
Equity Method Investments		$ 5,032,268	$ 5,610,874		$ 5,032,268
Insignia [Member]
Equity Security, Number of Shares Purchased During Period	1,133,000
Equity Security, Shares Purchased, Price Per Share	$ 1.25
Equity Method Investment, Aggregate Cost	$ 1,416,000,000,000
Equity Security Number Of Shares Purchased								1,900,000
Equity Method Investment, Ownership Percentage	26.00%	28.00%	30.00%		28.00%
Payments to Acquire Equity Method Investments		$ 385,000
Equity Method Investment, Number of Shares Held		3,400,000	3,500,000		3,400,000
Equity Method Investments		$ 4,599,000	$ 5,162,000		$ 4,599,000
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity, Total		$ 0	92,000		0
Equity Method Investment, Summarized Financial Information, Net Income (Loss)			$ 391,000	$ 1,399,000	$ 722,000	$ (639,000)

[1] Amounts represent results since The Fence Store's inception in May, 2017