EMPLOYEE STOCK OPTION PLANS (Details) (USD $)	9 Months Ended		3 Months Ended		9 Months Ended	0 Months Ended		3 Months Ended		9 Months Ended	0 Months Ended	9 Months Ended			0 Months Ended						3 Months Ended	9 Months Ended	12 Months Ended	0 Months Ended							0 Months Ended					3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2012 Range 76.74 to 152.98 [Member]	Dec. 31, 2011 Range 76.74 to 152.98 [Member]	Dec. 31, 2012 Stock Options [Member]	Dec. 31, 2011 Stock Options [Member]	Dec. 31, 2012 Stock Options [Member]	Jan. 15, 2012 Restricted Stock [Member]	Jan. 16, 2012 Restricted Stock [Member]	Dec. 31, 2012 Restricted Stock [Member]	Dec. 31, 2011 Restricted Stock [Member]	Dec. 31, 2012 Restricted Stock [Member]	Jan. 15, 2012 Phantom Stock Awards [Member]	Dec. 31, 2012 Phantom Stock Awards [Member]	Jan. 16, 2012 Phantom Stock Awards [Member]	Dec. 31, 2011 1999 Plan [Member] Range 76.74 to 152.98 [Member]	Jul. 20, 2009 1999 Plan [Member] Stock Options [Member]	Jul. 30, 2008 1999 Plan [Member] Stock Options [Member]	Jul. 21, 2008 1999 Plan [Member] Stock Options [Member]	Jul. 16, 2007 1999 Plan [Member] Stock Options [Member]	Jul. 17, 2006 1999 Plan [Member] Stock Options [Member]	May 15, 2006 1999 Plan [Member] Stock Options [Member]	Dec. 31, 2012 1999 Plan [Member] Stock Options [Member]	Dec. 31, 2012 1999 Plan [Member] Stock Options [Member]	Mar. 31, 2012 1999 Plan [Member] Stock Options [Member]	Jul. 20, 2009 1999 Plan [Member] Stock Options [Member] Minimum [Member]	Jul. 20, 2009 1999 Plan [Member] Stock Options [Member] Maximum [Member]	Jul. 18, 2011 2009 Plan [Member]	Jul. 19, 2010 2009 Plan [Member]	Mar. 22, 2010 2009 Plan [Member]	Oct. 19, 2009 2009 Plan [Member]	Dec. 31, 2012 2009 Plan [Member] Range 76.74 to 152.98 [Member]	Jul. 18, 2011 2009 Plan [Member] Stock Options [Member]	Jul. 19, 2010 2009 Plan [Member] Stock Options [Member]	Mar. 22, 2010 2009 Plan [Member] Stock Options [Member]	Oct. 19, 2009 2009 Plan [Member] Stock Options [Member]	Jul. 20, 2009 2009 Plan [Member] Stock Options [Member]	Dec. 31, 2012 2009 Plan [Member] Stock Options [Member]	Dec. 31, 2012 2009 Plan [Member] Stock Options [Member]	Mar. 31, 2012 2009 Plan [Member] Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)						47,000							26,000																						140,000
Options available for grant (in shares)								40,350		40,350																										70,250	70,250
Expiration period from date of grant															10 years																				10 years
Number of annual installments on exercise of awards																								5	10										5
Compensation expense			$ 33,769	$ 253,350				$ 27,797
Unrecognized compensation cost			1,040,698		1,040,698
Weighted average service period					1 year 6 months			4 years 1 month 6 days
Options fair value assumptions [Abstract]
Weighted average fair value (in dollars per share)																$ 29.93	$ 27.35	$ 41.78	$ 33.05	$ 31.28											$ 33.07	$ 28.58	$ 32.56	$ 25.36
Expected dividend yield (in hundredths)																0.62%	0.67%	0.39%	0.61%	0.64%											0.83%	0.91%	0.84%	1.04%
Risk free interest rate (in hundredths)																3.36%	3.41%	4.95%	5.04%	5.08%											1.45%	1.73%	2.43%	2.36%
Expected volatility (in hundredths)																20.20%	20.20%	19.90%	21.20%	21.10%											40.00%	37.50%	37.80%	37.60%
Expected life (in years)																5 years	5 years	5 years	7 years	7 years											5 years	5 years	5 years	5 years
Stock options [Roll Forward]
Balance at beginning of period (in shares)																						95,000	96,500														83,750	73,750
Granted (in shares)																						0	0			10,000	15,000	20,000	38,750								0	10,000
Exercised (in shares)	(37,205)	(1,500)																			1,015	(17,105)	(1,500)													1,300	(20,100)	0
Canceled / Forfeited (in dollars per share)	(28,395)																				4,000	(14,395)	0														(14,000)	0
Balance at end of period (in shares)			113,150		113,150																63,500	63,500	95,000													49,650	49,650	83,750
Weighted Average Exercise Price [Roll Forward]
Beginning of Period (in dollars per share)																						$ 113.63	$ 114.78														$ 85.75	$ 84.24
Granted (in dollars per share)																						$ 0	$ 0			$ 96.92	$ 88.20	$ 95.79	$ 76.74								$ 0	$ 96.92
Exercised (in dollars per share)																						$ 95.55	$ 65.70														$ 79.91	$ 0
Canceled / Forfeited (in dollars per share)																						$ 111.14	$ 0														$ 98.64	$ 0
Balance at end of period (in dollars per share)			$ 112.06		$ 112.06																$ 130.80	$ 130.80	$ 113.63													$ 88.11	$ 88.11	$ 85.75
Weighted average remaining contractual term, outstanding	1 year				1 year 6 months
Weighted average remaining contractual term, exercisable					1 year
Aggregate intrinsic value, outstanding			3,534,415		3,534,415
Aggregate intrinsic value, exercisable			2,263,512		2,263,512
Stock Awards [Abstract]
Award vesting period						5 years					5 years
Restricted stock granted to key employees (in shares)							9,650
Restricted stock available for issuance beginning balance (in shares)										37,350
Less restricted stock forfeited during the year										(3,000)
Restricted stock available for issuance ending balance (in shares)								40,350		40,350																										70,250	70,250
Unrecognized compensation cost								444,752		444,752
Number of shares [Rollforward]
Number of shares unvested beginning (in shares)										9,650		26,000
Granted (in shares)									0	0		0
Vested (in shares)										0		0
Forfeited or expired (in shares)										(3,000)		(7,500)
Number of shares unvested ending (in shares)								6,650		6,650		18,500
Weighted Average Exercise Price [Rollforward]
Weighted Average, Unvested Beginning (in dollars per share)										$ 83.60		$ 146.95
Weighted Average, granted (in dollars per share)										$ 0		$ 0
Weighted Average, vested (in dollars per share)										$ 0		$ 0
Weighted Average, forfeited or expired (in dollars per share)										$ 83.60		$ 146.95
Weighted Average, Unvested Ending (in dollars per share)								$ 83.60		$ 83.60		$ 146.95
Weighted Average Remaining Vesting Term (in Years) [Abstract]
Weighted Average Remaining Vesting Term Unvested Beginning										4 years 9 months 18 days		4 years 9 months 18 days
Weighted Average Remaining Vesting Term , granted										0 years		0 years
Weighted Average Remaining Vesting Term, vested										0 years		0 years
Weighted Average Remaining Vesting Term, Forfeited or expired										0 years		0 years
Weighted Average Remaining Vesting Term, Unvested Ending										4 years 9 months 18 days		4 years 9 months 18 days
Estimated deferred compensation liability												541,865
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in dollars per share)	$ 76.74
Exercise price range, upper range limit (in dollars per share)	$ 152.98
Weighted average remaining contractual term, outstanding	1 year				1 year 6 months
Canceled (in shares)	28,395																				(4,000)	14,395	0														14,000	0
Shares issued on exercise of stock options	37,205	1,500																			(1,015)	17,105	1,500													(1,300)	20,100	0
Options exercisable (in shares)														83,590																68,150
Weighted average exercise price (in dollars per share)														$ 113.04																$ 124.39
New shares issued for cash		$ 98,550