Note 1 - Description of Business (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash and Cash Equivalents, at Carrying Value, Ending Balance	$ 3,334,000	$ 1,652,000	$ 224,000
Net Income (Loss) Attributable to Parent, Total	$ 4,465,000	$ 2,287,000