Note 10 - Share-based Compensation (Tables)

12 Months Ended

Mar. 31, 2020

Notes Tables

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

	As of March 31, 20 20
	Authorized		Available		Outstanding
2016 Plan		1,300,000		1,183,415		67,766
2014 Directors Plan		350,000		184,400		116,724
2005 Plan		—		—		239,300
2004 Directors Plan		—		—		12,000
Total		1,650,000		1,367,815		435,790

Share-based Payment Arrangement, Option, 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, 2017		503,000		$	4.10		4.7	$	145,946
Granted		120,000			3.53
Exercised		(29,150	)		2.59
Forfeited		(3,700	)		4.50
Expired		(750	)		1.60
Outstanding at March 31, 2018		589,400		$	4.06		4.9	$	675,300
Granted		50,000			3.00
Exercised		(49,600	)		2.17
Expired		(50,000	)		4.82
Outstanding at March 31, 2019		539,800		$	4.06		4.9	$	675,300
Granted		5,000			2.11
Exercised		(2,112	)		2.08
Forfeited		(104,388	)		4.58
Expired		(120,000	)		3.53
Outstanding at March 31, 2020		318,300		$	4.08		3.0	$	—
Exercisable at March 31, 2020		280,800		$	4.22		2.3	$	—

Schedule of Nonvested Share Activity [Table Text Block]

Nonvested Options	Shares			Weighted Average Grant-Date Fair Value
Nonvested at March 31, 2019		130,000		$	1.70
Granted		5,000			1.10
Vested		(97,500	)		1.74
Nonvested at March 31, 2020		37,500		$	1.52

Share-based Payment Arrangement, Option, Exercise Price Range [Table Text Block]

			Outstanding Options						Exercisable Options
Range of Exercise Prices			Number of Shares		Remaining Life (Years)		Weighted Average Exercise Price		Number of Shares		Weighted Average Exercise Price
$2.11	-	$3.70		93,400		5.7	$	3.19		55,900	$	3.70
$3.71	-	$3.95		146,400		1.4	$	3.82		146,400	$	1.41
$3.96	-	$5.73		31,000		3.2	$	5.27		31,000	$	3.23
$5.74	-	$5.91		47,500		2.7	$	5.85		47,500	$	2.71
Total stock options				318,300		3.0	$	4.08		280,800	$	2.29

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

	20 20			201 9			201 8
Exercise Price	$	1.10		$	3.00		$	3.83
Volatility		50.61	%		49.94	%		51.91	%
Risk Free Rate		1.47	%		2.40	%		2.50	%
Vesting Period (in years)		0			4.0			3.0
Forfeiture Rate		0	%		0	%		0	%
Expected Life (in years)		6.9			6.3			6.0
Dividend Rate		0	%		0	%		0	%

Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]

Nonvested Restricted Stock Units	Shares			Weighted Average Grant Price
Nonvested restricted stock units at March 31, 2017		25,000		$	3.85
Granted		28,074		$	3.92
Vested		(8,333	)	$	3.85
Forfeited		(5,066	)	$	3.92
Nonvested restricted stock units at March 31, 2018		39,675		$	3.89
Granted		23,923		$	4.10
Vested		(16,003	)	$	3.88
Forfeited		(8,781	)	$	4.07
Nonvested restricted stock units at March 31, 2019		38,814		$	3.98
Granted		4,051		$	2.67
Vested		(24,483	)	$	3.76
Forfeited		(5,616	)	$	4.01
Nonvested restricted stock units at March 31, 2020		12,766		$	3.98