Note 2 - Summary of Significant Accounting Policies - Summary of Cash Balances (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash and Cash Equivalents, at Carrying Value, Ending Balance	$ 655,000	$ 990,000	$ 1,910,000
Parent Company [Member]
Cash and Cash Equivalents, at Carrying Value, Ending Balance	193,000	462,000
Noncontrolling Interest [Member]
Cash and Cash Equivalents, at Carrying Value, Ending Balance	$ 462,000	$ 528,000