Note 6 - Income Taxes (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount			$ (15,000)
Deferred Tax Assets, Valuation Allowance, Total	$ 8,500,000		8,500,000
Operating Loss Carryforwards, Total	33,700,000		33,700,000
Income Taxes Paid, Net, Total	0	$ 0	0	$ 0
Deferred Tax Assets, Net of Valuation Allowance, Total	$ 247,000		$ 247,000		$ 494,000
Effective Income Tax Rate Reconciliation, Percent, Total	0.00%		0.00%