UPDATE 1-Net U.S. dollar longs fall to lowest since Sept-CFTC and Reuters

(Adds table, details from latest data) NEW YORK, April 24 (Reuters) - Speculators reduced positive bets on the U.S. dollar, pushing the currency's net long position to their lowest since September, according to data from the Commodity Futures Trading Commission and Thomson Reuters released on Friday. The value of the dollar's net long position slipped to $37.87 billion in the week ended April 21 from $39.68 billion the previous week. Net longs on the dollar declined for a fourth strai