Note 2 - Summary of Significant Accounting Policies - Summary of Cash Balances (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash and Cash Equivalents, at Carrying Value, Ending Balance	$ 655,000	$ 655,000	$ 990,000
Parent Company [Member]
Cash and Cash Equivalents, at Carrying Value, Ending Balance	652,000	193,000
Noncontrolling Interest [Member]
Cash and Cash Equivalents, at Carrying Value, Ending Balance	$ 3,000	$ 462,000