Napco Security Technologies (NSSC -18.40%) grew first-quarter revenue 1.7% to $50.0 million, and shares fell about 17% in Monday trading. Equipment sales dropped 7.3% as two locking distributors cut orders, and recurring service revenue filled the gap. Net income rose 6.9%, but a $1.0 million litigation credit more than explains the gain. Excluding it, earnings per share were flat at $0.34.Key NumbersRecurring service revenue: $26.1 million, up 11.5%.Equipment revenue: $23.9 million, down 7.3%.Gross margin: ...