Qualstar revenues rose nearly 10 percent in 2019, after a fourth quarter where revenue jumped 17.2 percent to $3.4 million. Full-year revenue was $13.4 million but the Camarillo-based company reported a $7,000 net loss in the March 19 filing, compared to $1.48 million in net income the prior year, or 73 cents per share. Shares…