Note 3 - Investments (Details Textual)				3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 17, 2021 USD ($) $ / shares shares	Oct. 02, 2015 $ / shares shares	Mar. 30, 2012 USD ($) $ / shares shares	Sep. 30, 2021 USD ($) $ / shares	Sep. 30, 2021 USD ($) $ / shares	Dec. 31, 2020 USD ($) $ / shares	Dec. 31, 2018 $ / shares shares	Dec. 31, 2017 shares	Dec. 31, 2014 USD ($) shares
Arcimoto, Inc. [Member]
Share Price (in dollars per share) | $ / shares				$ 11.43	$ 11.43	$ 13.23
Arcimoto, Inc. [Member] | Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio								2
TangoMe, Inc, Series A Preferred Stock [Member]
Unrealized Gain (Loss) on Investments, Total				$ 2,206,856	$ 2,206,856	$ 0
Investment Owned, at Fair Value				4,781,521	4,781,521	2,574,666
TangoMe, Inc, Series A Preferred Stock [Member] | Chief Executive Officer [Member]
Investment Purchased, Shares (in shares) | shares			468,121
Investment Purchased, Price Per Share (in dollars per share) | $ / shares			$ 2.14
Investment Purchased, Value			$ 1,000,000
Arcimoto, Inc. Series A-1 Preferred Stock [Member]
Investment Purchased, Shares (in shares) | shares									37,000
Payments to Acquire Investments, Total									$ 100,011
Options in Arcimoto, Inc [Member]
Unrealized Gain (Loss) on Investments, Total				28,800
Investment Owned, at Fair Value				46,848	46,848	55,848
Investment Owned, Balance, Shares (in shares) | shares		2,500					5,000	74,000
Option Indexed to Issuer's Equity, Strike Price (in dollars per share) | $ / shares		$ 4.121					$ 2.0605
Common Stock in Arcimoto, Inc [Member]
Unrealized Gain (Loss) on Investments, Total				426,240
Investment Owned, at Fair Value				$ 845,820	$ 845,820	$ 979,020
Common Shares of Buoy Health, Inc [Member]
Investment Purchased, Shares (in shares) | shares	11,233
Investment Purchased, Price Per Share (in dollars per share) | $ / shares	$ 15.92
Investment Purchased, Value	$ 178,824