Note 12 - Income Taxes (Tables)

12 Months Ended

Mar. 31, 2013

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

	Year Ended March 31,
	2013		2012
Current:
Federal	$	820,000	$	195,000
State		146,000		41,000
Foreign		69,000		105,000
Total current		1,035,000		341,000
Deferred:
Federal		21,000		347,000
State		4,000		58,000
Total deferred		25,000		405,000
Total	$	1,060,000	$	746,000

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

	Year Ended March 31,
	2013				2012
Income tax provision at U.S. statutory rate	$	928,000	34.0	%	$	713,000		34.0	%
State income taxes, net of Federal benefit		99,000	3.6			60,000		2.9
Permanent differences, other		30,000	1.1			32,000		1.5
Other differences, net		3,000	0.1			(59,000	)	(2.8	)
Income tax provision	$	1,060,000	38.8	%	$	746,000		35.6	%

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

	March 31,
	2013			2012
Stock option compensation	$	360,000		$	353,000
Inventory reserves		296,000			290,000
Accrued vacation		227,000			202,000
Warranty reserve		78,000			95,000
Accounts and notes receivable reserve		25,000			108,000
Other		16,000			21,000
Gross deferred tax assets		1,002,000			1,069,000
Prepaid expenses		(232,000	)		(286,000	)
Property and equipment		(429,000	)		(417,000	)
Gross deferred tax liabilities		(661,000	)		(703,000	)
Net deferred tax asset	$	341,000		$	366,000