INCOME TAXES (Details) (USD $)	3 Months Ended								12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Reconciliation of unrecognized tax benefits [Roll Forward]
Beginning balance				$ 316,000				$ 719,000	$ 316,000	$ 719,000	$ 461,000
Additions for uncertain tax positions									0	0	403,000
Reductions to uncertain tax positions									0	(403,000)	(145,000)
Ending balance	316,000				316,000				316,000	316,000	719,000
Unrecognized tax benefits that would impact effective tax rate	434,000				424,000				434,000	424,000
Interest on income taxes expense included in statement of operation									17,000	31,000
Accrued interest on income taxes	197,000				180,000				197,000	180,000
Reconciliation of income taxes to the statutory rate [Abstract]
Statutory federal income tax rate (in hundredths)									35.00%	35.00%	35.00%
Income tax expense computed at the U.S. statutory federal rate									20,555,000	13,850,000	14,199,000
State income tax expense - net of federal benefit									2,894,000	2,096,000	1,861,000
Non-deductible executive compensation									150,000	152,000	81,000
Other									316,000	109,000	700,000
Provision for income taxes									23,915,000	16,207,000	16,841,000
Effective income tax rate (in hundredths)									40.70%	41.00%	41.50%
Current:
Federal									20,041,000	12,266,000	10,604,000
State									4,453,000	3,088,000	3,774,000
Foreign									36,000	59,000	39,000
Total current expense									24,530,000	15,413,000	14,417,000
Deferred:
Federal									(581,000)	814,000	2,846,000
State									(34,000)	(20,000)	(422,000)
Total deferred expense (benefit)									(615,000)	794,000	2,424,000
Provision for income taxes	5,043,000	6,496,000	6,875,000	5,501,000	3,152,000	5,691,000	4,784,000	2,580,000	23,915,000	16,207,000	16,841,000
Deferred Tax Assets:
Accrued vacation	1,345,000				1,174,000				1,345,000	1,174,000	1,174,000
Provision for bad debts	1,997,000				2,149,000				1,997,000	2,149,000	1,024,000
State net operating loss carryforward	1,505,000				1,217,000				1,505,000	1,217,000	1,296,000
Basis difference in fixed assets	0				0				0	0	147,000
Book compensation on discounted stock options	77,000				262,000				77,000	262,000	611,000
Deferred compensation	898,000				797,000				898,000	797,000	716,000
Deferred revenue	221,000				140,000				221,000	140,000	203,000
Foreign tax credit	0				0				0	0	72,000
Federal net operating loss carry forward	168,000				111,000				168,000	111,000	0
Other accruals and reserves	2,043,000				1,918,000				2,043,000	1,918,000	1,206,000
Gross deferred tax assets	8,254,000				7,768,000				8,254,000	7,768,000	6,449,000
Less: valuation allowance	(1,505,000)				(1,217,000)				(1,505,000)	(1,217,000)	(1,296,000)
Net deferred tax assets	6,749,000				6,551,000				6,749,000	6,551,000	5,153,000
Deferred Tax Liabilities:
Basis difference in fixed assets	(491,000)				(378,000)				(491,000)	(378,000)	0
Basis difference in operating lease items	(8,765,000)				(9,764,000)				(8,765,000)	(9,764,000)	(8,645,000)
Basis difference in tax deductible goodwill	(2,288,000)				(2,195,000)				(2,288,000)	(2,195,000)	(735,000)
Total deferred tax liabilities	(11,544,000)				(12,337,000)				(11,544,000)	(12,337,000)	(9,380,000)
Net deferred tax liabilities	(4,795,000)				(5,786,000)				(4,795,000)	(5,786,000)	(4,227,000)
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 28,000,000								$ 28,000,000
Expiration date									2023