Note 8 - Earning (Loss) Per Common Share (Tables)
|9 Months Ended|
Sep. 30, 2018
|Schedule of Weighted Average Number of Shares [Table Text Block]||
Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit).
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef