SEGMENT AND GEOGRAPHIC DATA (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Mar. 31, 2018	Dec. 23, 2017	Sep. 23, 2017	Jun. 24, 2017	Mar. 25, 2017	Dec. 24, 2016	Sep. 24, 2016	Jun. 25, 2016	Mar. 31, 2018		Mar. 25, 2017
Revenue:
Revenue		$ 42,452	$ 40,483	$ 35,927	$ 36,279	$ 38,453	$ 37,813	$ 34,485	$ 33,147	$ 155,141	[1]	$ 143,898	[1]
Gross Profit:
Gross Profit		10,895	9,701	8,154	8,691	9,782	8,915	8,027	8,246	37,441		34,970
Operating Expenses:
Operating Expenses										28,415		27,036
Operating Income:
Operating Income										9,026		7,934
Unallocated Amounts:
Interest and Other Expense, net										1,078		770
Provision for Income Taxes										2,026		2,642
Net Income		2,454	$ 1,831	$ 781	$ 856	1,429	$ 1,271	$ 916	$ 906	5,922		4,522
Total Assets:
Assets		96,822				92,097				96,822		92,097
Depreciation and Amortization:
Depreciation and Amortization										5,991		6,184
Capital Expenditures:
Capital Expenditures										5,882		5,250
Property and Equipment:
Property and Equipment		17,091				15,568				17,091		15,568
United States [Member]
Revenue:
Revenue	[1],[2]									139,456		129,732
Property and Equipment:
Property and Equipment	[2]	15,967				14,550				15,967		14,550
Canada [Member]
Revenue:
Revenue	[1]									13,757		12,432
Property and Equipment:
Property and Equipment		1,124				1,018				1,124		1,018
Other International [Member]
Revenue:
Revenue	[1]									1,928		1,734
Service Segment [Member]
Revenue:
Revenue										77,445		71,103
Gross Profit:
Gross Profit										19,922		19,039
Operating Expenses:
Operating Expenses	[3]									14,764		14,270
Operating Income:
Operating Income										5,158		4,769
Total Assets:
Assets		53,032				51,756				53,032		51,756
Depreciation and Amortization:
Depreciation and Amortization	[4]									4,397		4,660
Capital Expenditures:
Capital Expenditures										3,772		2,662
Distribution [Member]
Revenue:
Revenue										77,696		72,795
Gross Profit:
Gross Profit										17,519		15,931
Operating Expenses:
Operating Expenses	[3]									13,651		12,766
Operating Income:
Operating Income										3,868		3,165
Total Assets:
Assets		40,652				36,812				40,652		36,812
Depreciation and Amortization:
Depreciation and Amortization	[4]									1,594		1,524
Capital Expenditures:
Capital Expenditures										2,110		2,588
Segment Reconciling Items [Member]
Unallocated Amounts:
Interest and Other Expense, net										1,078		770
Provision for Income Taxes										2,026		2,642
Unallocated Amounts										3,104		3,412
Unallocated [Member]
Total Assets:
Assets		$ 3,138				$ 3,529				$ 3,138		$ 3,529

[1] Revenues are attributed to the countries based on the destination of a product shipment or the location where service is rendered.

[2] United States includes Puerto Rico.

[3] Operating expense allocations between segments are based on actual amounts, a percentage of revenues, headcount, and management's estimates.

[4] Including amortization of catalog costs and intangible assets.