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Note 8 - Restricted Stock (Details Textual) - USD ($) $ in Thousands	1 Months Ended			12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2012	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018	Jul. 28, 2006
Percentage of Automatic Increase in Shares Available for Issuance			10.00%
Share-based Payment Arrangement, Noncash Expense, Total				$ 2,822	$ 3,097	$ 2,575
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)				183,000	150,000
2006 Employee Equity Compensation Restricted Stock Plan (the "Employee Plan") | Restricted Stock [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares)				972,175			1,000,000
2006 Outside Director Equity Compensation Restricted Stock Plan (the "Director Plan") [Member] | Restricted Stock [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares)			400,000	272,000			200,000
2015 Outside Director Equity Compensation Restricted Stock Plan [Member] | Restricted Stock [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares)		400,000		135,000
Percentage of Automatic Increase in Shares Available for Issuance		10.00%
2016 Employee Equity Compensation Restricted Stock Plan [Member] | Restricted Stock [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares)	1,000,000			153,608
2016 Employee Equity Compensation Restricted Stock Plan [Member] | Restricted Stock [Member] | Minimum [Member]
Restriction Period (Year)	1 year
2016 Employee Equity Compensation Restricted Stock Plan [Member] | Restricted Stock [Member] | Maximum [Member]
Restriction Period (Year)	10 years
Employee and Director Equity Compensation Plan [Member] | Non-vested Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)				182,695	150,017
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total (in shares)				105,925	72,899
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total				$ 2,600	$ 3,900
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)				1 year 292 days	1 year 255 days

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Aggregate number of common shares reserved for future issuance.

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-Topic 210
-SubTopic 10
-Section S99
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Amount of noncash expense for share-based payment arrangement.

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Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

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