Note 5 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Deferred Income Tax Expense (Benefit), Total	$ (988,000)
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	1.10
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	34,000	80,000
Liability for Uncertainty in Income Taxes, Current	190,000	$ 358,000
Domestic Tax Authority [Member]
Operating Loss Carryforwards, Total	33,700,000
State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total	$ 23,900,000