Note 3 - Earnings/(Loss) Per Share - Reconciliation of Anti-dilutive Securities (Details) - shares	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Anti-dilutive Security (in shares)	14,396,945	31,752,126
Employee Stock Option [Member]
Anti-dilutive Security (in shares)	1,295,000	3,850,000
Warrant [Member]
Anti-dilutive Security (in shares)	12,550,000	27,020,000
Convertible Debt Securities [Member]
Anti-dilutive Security (in shares)	440,000	740,000
Shares Issuable For Accrued Interest [Member]
Anti-dilutive Security (in shares)	111,945	142,126