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Note 7 - Derivative Obligations - Fair Value Hierarchy (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivative obligations		$ 1,000	$ 597,000
Fair Value, Recurring [Member]
Derivative obligations		1,000
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Derivative obligations
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Derivative obligations
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Derivative obligations		$ 1,000