Note 13 - Net Income (Loss) Per Share - Computation of Basic and Diluted Per Share Data (Details) - USD ($) |
3 Months Ended | 6 Months Ended | 9 Months Ended | ||||
|---|---|---|---|---|---|---|---|
Mar. 31, 2020 |
Dec. 31, 2019 |
Mar. 31, 2019 |
Dec. 31, 2018 |
Mar. 31, 2020 |
Mar. 31, 2019 |
Sep. 30, 2019 |
|
| Net Income (Loss) | $ (72,000) | $ 1,045,000 | $ 1,773,000 | $ 1,275,000 | $ 973,000 | $ 3,048,000 | $ 6,910,000 |
| Basic earnings (loss) per common share (in dollars per share) | $ (0.01) | $ 0.27 | $ 0.15 | $ 0.46 | $ 1.04 | ||
| Diluted earnings per common share (in dollars per share) | $ (0.01) | $ 0.27 | $ 0.15 | $ 0.46 | $ 1.04 | ||
| Basic (in shares) | 6,567,765 | 6,685,415 | 6,567,765 | 6,685,415 | |||
| Incremental Common Shares Attributable to Share-based Payment Arrangements, Total (in shares) | 412 | 87,108 | 360 | ||||
| Diluted (in shares) | 6,567,765 | 6,685,827 | 6,654,873 | 6,685,775 | |||