Not heard of it before.. but interestingly on that link it says that Mickle means large... well there's an old Scottish saying which is in common parlance which says ''Mony a mickle maks a muckle''...which is making the mickle a small thing...
However, it became corrupted to many a mickle makes a muckle, leading to mickle being thought to mean “a small quantity” and muckle to mean “a large quantity”, even though muckle is a variant of mickle and both mean “a large quantity”.