Note 7 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Deferred Income Tax Expense (Benefit), Total		$ (988,000)
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	4,000
Liability for Uncertainty in Income Taxes, Current	23,000	34,000
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	$ 124,000	$ 190,000
Open Tax Year	2011 2012 2013 2014 2015 2016 2017
Domestic Tax Authority [Member]
Operating Loss Carryforwards, Total	$ 33,800,000
State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total	$ 24,100,000