Annual report pursuant to Section 13 and 15(d)

Note 11 - Income Taxes - Unrecognized Tax Benefit Roll Forward (Details)

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Note 11 - Income Taxes - Unrecognized Tax Benefit Roll Forward (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Balance $ 397,000 $ 268,000
Additions based upon tax positions related to the current year 53,000 129,000
Balance $ 450,000 $ 397,000