A secret military trial in Uzbekistan

The Diplomat reports here on the closed-door military trial of Kadyr Yusupov, a retired Uzbek diplomat. He was apparently convicted of spying for a Western country. One can understand why at least parts of an espionage case might be conducted behind closed doors, but why a trial in a military court if the defendant is a civilian? Was there concern that evidence of torture might have become public? And if the defendant was guilty of espionage, wouldn't the sentence have been longer. Or was that a reflection of his mental illness? Lots of questions on this one.