The pilot made his landing approach to runway 08 at 65 mph IAS and "moderate" power. He misjudged his altitude and was too high. He crossed the runway threshold approximately 35 feet above, applied full flaps, and reduced power to idle. The airplane sank and "a small amount" of power was applied initially. Then, "significant power" was applied. The airplane impacted on the runway 150 feet past the threshold and bounced. It contacted the runway again in a right wing-low attitude, swerved 90 degrees to the right, and skidded to a halt.