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Note 2 - Significant Accounting Policies (Details Textual) - USD ($)	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Retained Earnings (Accumulated Deficit), Ending Balance	$ (82,719,000)		$ (72,450,000)
Cash and Cash Equivalents, at Carrying Value, Ending Balance	$ 4,820,000		$ 12,689,000	$ 13,326,000	$ 21,352,000
Accounting Standards Update 2014-09 [Member]
Retained Earnings (Accumulated Deficit), Ending Balance		$ (76,000)

X

- Definition

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. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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