Note 2 - Summary of Significant Accounting Policies - Warrants (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Common Stock Issued (in shares)		300,911
Proceeds		$ 1,263,766
Series A Warrants [Member]
Common Stock Issued (in shares)		251
Proceeds		$ 1,054
Series K Warrants [Member]
Common Stock Issued (in shares)		300,660
Proceeds		$ 1,262,712