Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Property and Equipment (Details Textual)

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Note 4 - Property and Equipment (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Depreciation, Nonproduction $ 0.1 $ 0.1 $ 0.2 $ 0.2