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Note 14 - Stockholders' Equity (Details Textual) - USD ($)						3 Months Ended
	Feb. 14, 2020	Mar. 28, 2019	Mar. 21, 2019	Sep. 23, 2015	Nov. 13, 2014	Mar. 31, 2020	Mar. 31, 2019	Mar. 12, 2020	Dec. 31, 2019	Aug. 24, 2018	Aug. 23, 2018	Nov. 11, 2015
Preferred Stock, Shares Authorized (in shares)						5,000,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share)						$ 0.0001
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 0.65											$ 3.60
Dividends, Paid-in-kind, Total	$ 41,688					$ 112,686
Director [Member]
Stock Issued During Period, Shares, Issued for Services (in shares)		13,820				0
Stock Issued During Period, Value, Issued for Services		$ 16,506
Certain Officers, Employees, and Contractors [Member] | Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)			235,334			0
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)			3 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)			7 years
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)			$ 1.18
Convertible Note Due in July 13, 2020 [Member]
Debt Instrument, Convertible, Conversion Price (in dollars per share)	$ 1.15
September 2015 Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	384,618									166,668	69,445
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)										$ 1.50	$ 3.60
Promissory Note [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)				69,445
Amended Note [Member] | Senior Secured Convertible Note [Member]
Debt Instrument, Convertible, Conversion Price (in dollars per share)	$ 0.65							$ 0.65
Private Investor SPA [Member]
Stock Issued During Period, Shares, New Issues (in shares)					664,584
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)					996,877
Proceeds from Issuance of Private Placement					$ 1,595,000
Series A-1 Convertible Preferred Stock [Member]
Preferred Stock, Shares Authorized (in shares)						100,000
Series B-1 Convertible Preferred Stock [Member]
Preferred Stock, Shares Authorized (in shares)						105,000
Preferred Stock, Shares Outstanding, Ending Balance (in shares)						0			0
September 2015 Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)				$ 3.60
Term Of Warrant (Year)				5 years

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