Note 8 - Share-based Compensation (Tables)

12 Months Ended

Mar. 31, 2015

Notes Tables

Schedule of Share-based Compensation Shares Authorized Available and Outstanding by Plan [Table Text Block]

	As of March 31, 201 5
	Authorized		Available		Outstanding
2014 Plan		350,000		333,439		—
2005 Plan		2,075,000		398,818		1,421,216
2004 Directors Plan		—		—		12,000
Total		2,425,000		732,257		1,433,216

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

Option Activity	Shares			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value
Outstanding at March 31, 2012		1,251,166		$	3.54		9.0	$	8,243,956
Granted		258,000		$	6.30
Exercised		(9,970	)	$	2.34
Forfeited		(3,340	)	$	3.21
Outstanding at March 31, 2013		1,495,856		$	4.03		8.3	$	1,174,810
Granted		6,000		$	5.56
Exercised		(15,100	)	$	2.43
Forfeited		(17,450	)	$	4.53
Outstanding at March 31, 2014		1,469,306		$	4.04		7.3	$	2,034,303
Granted		45,000		$	4.72
Exercised		(60,200	)	$	3.58
Forfeited		(20,890	)	$	4.28
Outstanding at March 31, 2015		1,433,216		$	4.08		6.4	$	6,221,909
Exercisable at March 31, 2015		818,800		$	3.73		6.1	$	3,843,905

Schedule of Nonvested Share Activity [Table Text Block]

Nonvested Options	Shares			Weighted Average Grant-Date Fair Value
Nonvested at March 31, 2014		851,066		$	3.22
Granted		45,000			2.73
Vested		(264,570	)		3.06
Forfeited		(17,080	)		3.18
Nonvested at March 31, 2015		614,416		$	3.25

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

				Outstanding Options						Exercisable Options
Range of Exercise Prices				Number of Shares		Remaining Life (Years)		Weighted Average Price		Number of Shares		Weighted Average Price
	$1.60	-	$3.70		395,820		5.5	$	2.93		395,820	$	2.93
	$3.71	-	$4.42		695,396		6.4	$	3.82		291,480	$	3.82
	$4.43	-	$5.40		117,500		7.9	$	5.00		41,000	$	5.18
	$5.41	-	$7.08		224,500		7.3	$	6.42		90,500	$	6.23
	Total stock options				1,433,216		6.4	$	4.08		818,800	$	3.73

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	201 5			201 4			201 3
Exercise Price	$	4.72		$	5.56		$5.26	-	7.08
Volatility		64.00	%		38.00	%	78.26	-	80.39%
Risk Free Rate		1.74	%		0.14	%	0.85	-	0.93%
Vesting Period	3 years			6 months			5	-	7 years
Forfeiture Rate		4.51	%		0.00	%	7.66	-	9.00%
Expected Life (in years)		5.73			1.00			6.25
Dividend Rate		0	%		0	%		0	%