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Note 9 - Preferred Stock (Tables)

6 Months Ended

Jun. 30, 2019

Notes Tables

Schedule of Preferred Stock [Table Text Block]

		June 30, 2019								December 31, 2018
						Carrying								Carrying
		Shares				Value				Shares				Value
Series B Convertible Preferred Stock			100				76,095				100				76,095
Series C Convertible Preferred Stock			-				-				2,150				705,238
Series E Convertible Preferred Stock			-				-				1,200				1,190,000
Series F Convertible Preferred Stock			2,302				1,418,822				-				-
Series G Convertible Preferred Stock			1,000				842,950				-				-
Total			3,402				2,337,867				3,450				1,971,333