2 SMA'S COME WITHIN 200 FT VERTLY WHEN LNDG TFC FLIES OVER A C152 WHO HAD CROSSED THE HOLD LINE FOR THE ACTIVE RWY. CTAF WAS IN USE WITH LNDG ACFT HAVING CALLED FINAL 15 SECONDS BEFORE OTHER ACFT ANNOUNCED TAKING THE RWY.

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I WAS SHORT FINAL WITH MY STUDENT APPROX 300 FT AGL LNDG RSN. A C152 CALLED DEPARTING ON THE RWY I WAS LNDG ON APPROX 15 SECONDS AFTER I CALLED FINAL ON CTAF. I IMMEDIATELY WARNED THE PLT; TELLING HIM I WAS SHORT FINAL. HE ACKNOWLEDGED. MY STUDENT AND I WERE COMING IN HIGH AND CROSSED THE THRESHOLD ABOUT 200 FT AGL. I HAD THE OTHER ACFT IN SIGHT AT ALL TIMES. AFTER I WARNED THE PLT; HE STOPPED APPROX 10-20 FT PAST THE HOLD SHORT LINE. AFTER I PASSED OVER HIM (IN SIGHT); I LOST SIGHT OF HIM AND THOUGHT HE WENT BACK TO THE OTHER SIDE OF THE HOLD SHORT LINE (NON ACTIVE). I FELT THERE WAS NO DANGER; AND I WAS POSITIVE THE SAFETY OF THE FLT WAS NOT BEING JEOPARDIZED; SO I LANDED THE ACFT. WHEN I CLRED THE RWY HE WAS STILL ON THE ACTIVE SIDE OF THE HOLD SHORT LINE; BUT NOT ON THE RWY. SUPPLEMENTAL INFO FROM ACN 396352: AFTER DOING RUNUP WITH STUDENT; I LOOKED FOR TFC ON FINAL AND CROSSED THRESHOLD. HEARD WARNING CALLED FROM EITHER ACFT BEHIND ME ON TXWY OR ACFT ON SHORT FINAL. HIT BRAKES; CAME TO A STOP. ASKED WHERE ACFT WAS AND SAW ITS WINGS. WHAT I BELIEVED CAUSED THE PROB WAS MY COMPLACENCY FROM OPERATING OUT OF THE SAME FIELD AND EXPECTING NOT TO SEE OTHER ACFT THAT CLOSE. BOY WAS I SURPRISED. TO PREVENT THIS; I NEED TO KEEP A BETTER LOOKOUT BEFORE DEP.