Note 6 - Preferred Stock (Details Textual) - $ / shares	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Preferred Stock, Shares Authorized (in shares)	2,445,598	2,445,598
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.01	$ 0.01
Preferred Stock, Shares Outstanding, Ending Balance (in shares)	0	0
Series A Preferred Stock [Member]
Preferred Stock, Shares Authorized (in shares)	3,000,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.01
Preferred Stock, Dividend Rate, Percentage	10.00%
Preferred Stock, Conversion Basis	1
Common Stock For Conversion (in shares)	554,402
Preferred Stock Number Of Authorized Shares Remaining (in shares)	2,445,598
Preferred Stock, Shares Outstanding, Ending Balance (in shares)	0