It's rare to see a total this low on a game involving Northern Arizona. The Lumberjacks have the top scorer in the Big Sky Conference, Cameron Shelton. He averages 20.2 points a game. The Lumberjacks also are one of the worst defenses in the country giving up 75.4 points while ranking 345th in defensive field goal percentage and 339th in 3-point defense. They are giving up an average of 85.7 points during their past four games.
Both teams are stepping way down in class for this first-round Big Sky Conference Tournament matchup at neutral site Boise, Idaho. Northern Arizona just played its last four games against the conference's two best teams, Southern Utah and Weber State. The Lumberjacks averaged 71 points in their last two games.  
Portland State just played two games against Southern Utah, the No. 1 team in the Big Sky. So the Vikings' current low scoring numbers are skewed. 
This is the first meeting of the season between Northern Arizona and Portland State. I see that as a plus for the Over since the team's lack familiarity with each other. Northern Arizona could have problems, for instance, handling Portland State's full-court defensive pressure. Vikings guard James Scott led the Big Sky in steals. He's also averaging 18 points in his last three games and is a good ball distributor. 
Note, too, that Portland State ranks 12th in the nation in offensive rebounding. So they should be able to get a number of putbacks against a defense as soft as Northern Arizona's.