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Note 2 - Basis of Presentation	6 Months Ended
Note 2 - Basis of Presentation	Jun. 30, 2018
Notes to Financial Statements
Basis of Accounting [Text Block]	2 . Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the U.S. (“GAAP”) for interim financial information and with the instructions to Form 10 -Q and Article 10 of Regulation S- X. Accordingly, they do not include all of the information and disclosures required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. Operating results for the three and six months ended June 30, 2018 are not necessarily indicative of the results that may be expected for other quarters or the year ending December 31, 2018. The condensed consolidated balance sheet as of December 31, 2017 has been derived from the audited financial statements as of that date, but does not include all of the information and disclosures required by GAAP. For more complete financial information, these unaudited condensed consolidated financial statements and the notes thereto should be read in conjunction with the audited financial statements included in our Annual Report on Form 10 -K for the year ended December 31, 2017, which was filed with the SEC on February 27, 2018.