New Delhi, Sept. 21 -- When a group of dairy families opened Idaho Milk Products a decade ago, the company faced a murky future at best. The $80 million facility began churning out cream and protein during a recession, at a time of painfully low milk prices.

"These dairy families risked everything," Idaho Dairymen's Association CEO Rick Naerebout said. "They rolled the dice, put everything on the line that their families had built for generations."

Ten years and a $30 million plant expansion later, it looks like the gamble is paying off.

"No one ever wants to be arrogant or overconfident," Idaho Milk Products CEO Daragh Maccabee said. "But we have, generally speaking, over the last while, had more demand than capacity to produce."

Idaho...