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Note 10 - Fair Value Measurements and Other Financial Instruments - Valuation Techniques (Details)	Sep. 30, 2018 yr
Minimum [Member] \| Measurement Input, Exercise Price [Member]
Derivative valuation assumption	1.2
Minimum [Member] \| Measurement Input, Risk Free Interest Rate [Member]
Derivative valuation assumption	0.0232
Minimum [Member] \| Measurement Input, Price Volatility [Member]
Derivative valuation assumption	1.3
Minimum [Member] \| Measurement Input, Expected Term [Member]
Derivative valuation assumption	0.47
Maximum [Member] \| Measurement Input, Exercise Price [Member]
Derivative valuation assumption	1.22
Maximum [Member] \| Measurement Input, Risk Free Interest Rate [Member]
Derivative valuation assumption	0.0293
Maximum [Member] \| Measurement Input, Price Volatility [Member]
Derivative valuation assumption	2
Maximum [Member] \| Measurement Input, Expected Term [Member]
Derivative valuation assumption	4.82