Small resource deficits never destroy ships

**Describe the bug**
If you have a small resource deficit, such that you can't afford to pay all of your maintenance costs, but not enough to destroy a ship, you can get away with that for as long as you like with no penalty.

**Steps to reproduce**
1. Accrue a small resource deficit, say, 1000 resources per turn
2. Wait a few turns

**Expected behavior**
At least one ship should be lost due to unpaid maintenance.

**Actual behavior**
No ships are lost.

**Screenshots**
N/A

**Related issues**
N/A

**Testing plan**
???

**Additional context**
How did SE4 handle this anyway? Did you lose a ship every turn even for small deficits? Did the deficits accrue over time until they added up to enough to destroy a ship? Was there a chance to lose a ship proportional to the amount of unpaid maintenance?