Note 10 - Preferred Stock (Details Textual) - USD ($)		1 Months Ended		12 Months Ended
	Nov. 26, 2019	Dec. 31, 2019	Nov. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Series A Convertible Preferred Stock Into Common Stock [Member]
Conversion of Stock, Shares Converted		3,021,237	600,000
Series A Preferred Stock [Member]
Convertible Preferred Stock, Shares Issued upon Conversion		1	1	1
Preferred Stock, Shares Outstanding, Ending Balance		1,852,173		1,852,173	0
Series B Preferred Stock [Member]
Preferred Stock, Shares Outstanding, Ending Balance		31,678		31,678	0
Preferred Stock, Dividend Rate, Percentage	12.50%
Preferred Stock Dividends, Shares				378
Dividends, Preferred Stock, Cash				$ 2,400
Preferred Stock, Fair Value, Per Share	$ 1,023.23
Convertible Preferred Stock, Fair Value	$ 32,027,000
Stock Issued During Period, Shares, Conversion of Convertible Securities	31,300