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Note 8 - Basic and Diluted Net Income (Loss) Per Share (Details Textual) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Weighted Average Number of Shares Outstanding, Basic, Total 3,803,000 3,803,000 3,803,331 3,803,331
Weighted Average Number of Shares Outstanding, Diluted, Total 3,817,781 3,826,920 3,803,000 3,803,000
Weighted Average Number of Shares Outstanding, Assuming Dilution     3,817,078 3,858,828