Note 8 - Stockholders' Equity - Compensation Expense 2 (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Share-Based Payment Arrangement, Expense | $ 120 | $ 274 | $ 329 | $ 488 |
| Location, Statement of Income, Balance [Axis]: us-gaap:OperatingExpenses | ||||
| Share-Based Payment Arrangement, Expense | 120 | 152 | 329 | 366 |
| Location, Statement of Income, Balance [Axis]: blin:FairValueAdjustmentOfContingentConsiderationInterestIncomeExpenseAndOtherNet | ||||
| Share-Based Payment Arrangement, Expense | $ 0 | $ 122 | $ 0 | $ 122 |