Note 6 - Fair Value Measurements and Financial Instruments - Derivatives Measured at Fair Value (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Balance at beginning of year	$ 5,138,857	$ 10,035,625
Issuance of additional Series 2023 Notes	18,807	36,665
Balance at end of year	2,176,552	5,138,857
Series 2023 PIK Note Derivative Liability [Member] | Fair Value, Inputs, Level 3 [Member]
Issuance of additional Series A Notes	247,931	395,082
Series A PIK Note Derivative Liability [Member] | Fair Value, Inputs, Level 3 [Member]
Issuance of additional Series A Notes	$ (3,229,043)	$ (5,328,515)