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Note 10 - Stockholders' Equity - Preferred Stock Summary (Details) - USD ($)
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Preferred stock, shares outstanding (in shares) 400   2,486
Preferred Stock $ 376,095   $ 1,932,433
Series B Convertible Preferred Stock [Member]      
Preferred stock, shares outstanding (in shares) 100   100
Preferred Stock $ 76,095   $ 76,095
Series H Convertible Preferred Stock [Member]      
Preferred stock, shares outstanding (in shares) 0   1,686
Preferred Stock   $ 1,156,338
Series I Convertible Preferred Stock [Member]      
Preferred stock, shares outstanding (in shares) 0   700
Preferred Stock   $ 700,000
Series J Convertible Preferred Stock [Member]      
Preferred stock, shares outstanding (in shares) 300 300
Preferred Stock $ 300,000