Note 2 - Net Income Per Share (Tables)
|6 Months Ended|
Mar. 31, 2021
|Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]||
Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations.
Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef