Note 15 - Equity Transaction (Details Textual) - USD ($)			3 Months Ended
	Jan. 13, 2020	Jan. 03, 2020	Mar. 31, 2020	Feb. 24, 2020
Series A Preferred Stock Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)			$ 1
Class of Warrant or Right, Outstanding (in shares)			612,660
Warrants and Rights Outstanding			$ 753,000
Series A Preferred Stock Warrants [Member] | Measurement Input, Expected Term [Member]
Warrants and Rights Outstanding, Term			5
Series A Preferred Stock Warrants [Member] | Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Term			155
Series A Preferred Stock Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member]
Warrants and Rights Outstanding, Term			1.19
Series A Preferred Stock Warrants [Member] | Measurement Input, Expected Dividend Rate [Member]
Warrants and Rights Outstanding, Term			0
Conversion of Debt to Series A Preferred [Member]
Debt Conversion, Original Debt, Amount			$ 478,000
Purchase Agreement [Member] | Series A Preferred Stock [Member]
Sale of Stock, Shares Agreed to Purchase (in shares)		500,000
Shares Issued, Price Per Share (in dollars per share)		$ 10
Sale of Stock, Offering Amount		$ 5,000,000
Preferred Stock, Dividend Rate, Percentage		8.00%
Preferred Stock, Par or Stated Value Per Share (in dollars per share)		$ 10
Preferred Stock, Liquidation Preference Per Share (in dollars per share)		10
Preferred Stock, Convertible, Conversion Price (in dollars per share)		$ 1
Preferred Stock, Number of Votes		10
Percentage Holders of Preferred Stock Consent Required if Greater than 50,000 Shares Outstanding		80.00%
Shares Issued, Price Per Share (in dollars per share)		$ 10
First Closing of the Offering [Member] | Series A Preferred Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares)	250,000
Proceeds from Issuance of Preferred Stock and Preference Stock	$ 2,500,000
Purchase Agreement Amendment [Member] | Series A Preferred Stock Warrants [Member]
Sale of Stock, Offering Fee, Percent			10.00%
Class Of Warrant Or Right, Percentage Of Common Stock Issuable			10.00%
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)			$ 1
Purchase Agreement Amendment [Member] | Common Stock [Member]
Sale of Stock, Contingent Additional Offered Shares (in shares)				140,000
Purchase Agreement Amendment [Member] | Series A Preferred Stock [Member]
Sale of Stock, Shares Agreed to Purchase (in shares)				70,000
Sale of Stock, Offering Amount				$ 700,000
Stock Issued During Period, Shares, New Issues (in shares)			90,860
Proceeds from Issuance of Preferred Stock and Preference Stock			$ 426,600
Shares Issued, Price Per Share (in dollars per share)				$ 10
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs			1,679,000
Preferred Stock, Convertible, Beneficial Conversion Feature			$ 2,200,000