Note 1 - Significant Accounting Policies - Assets and Liabilities at Fair Value on a Recurring Basis (Details) - USD ($)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restricted Cash	$ 100,000	$ 100,000
Total	4,881,000	4,798,000	$ 3,791,000
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Cash	4,781,000	4,698,000
Unrealized Gains
Unrealized Losses
Restricted Cash	100,000	100,000
Total	$ 4,881,000	$ 4,798,000

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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