Note 9 - Income Taxes - Components of the Deferred Tax Asset (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Net operating loss carryforwards	$ 62,216,000	$ 81,335,000
Other Deferred tax assets, net	2,415,000	2,714,000
Subtotal	64,631,000	84,049,000
Valuation allowance	(64,631,000)	(84,049,000)
Total deferred tax asset