15-20 "Craft" with yellowish lights flying from south to north over South Boise and Meridian idahoFriday December 4, 2015, between 2145 and 2200 hours, my friend and I came out of the Majestic Movie theater in Meridian, Idaho. I noticed a lot of lights in the sky to the south over what I would say would be south Meridian or South of Boise, Idaho. There were several lights that looked to be following each other in line, maybe 8-10 in the first group. They were flying north and then several stopped, or hovered, above West Boise, while others continued in different directions. There was NO noise. I'm prior military and I've been around aircraft all my life and I know the different sounds from rotor-craft to fixed wing. I stepped into a frozen yogurt place for a second and then came back out and saw another formation coming from the south. This was the best picture I got as they left single file and began to make some odd formations. The second group had 8-10 craft as well.I called Ada County Dispatch to see if they'd received any other reports of odd lights and they had not. They contacted Boise Airport and they did not have anything abnormal reported, nor did they have any radar information of 15-20 craft in the area. I contacted Boise Tower myself the next day and they confirmed that with me. Dispatch also talked with Gowen field and they did not have any night operations going.We have Apaches, A-10's. and F-15's flying constantly in the area, but none of those were in training that night. I should also point out, there were no flashing lights on these craft, just the slightly yellowish steady light you see here.The weather was cold and at the moment, it was slightly overcast in that general direction.The lights were moving at a speed that would be typical for final approach to Boise except when they hovered.