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Note 5 - Fair Value of Financial Instruments (Tables)

9 Months Ended

Dec. 31, 2021

Notes Tables

Investments Classified by Contractual Maturity Date [Table Text Block]

Total				<1 Year				1–3 Years				3–5 Years
$	57,293,870			$	30,114,318			$	22,148,686			$	5,030,866

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

		As of December 31, 2021												As of March 31, 2021
		Level 1				Level 2				Total				Level 1				Level 2				Total
Money market funds		$	7,631,824			$	-			$	7,631,824			$	10,143,196			$	-			$	10,143,196
Corporate bonds			-				49,662,046				49,662,046				-				54,717,626				54,717,626
Total		$	7,631,824			$	49,662,046			$	57,293,870			$	10,143,196			$	54,717,626			$	64,860,822

Schedule of Available-for-sale Securities Reconciliation [Table Text Block]

		As of December 31, 2021																As of March 31, 2021
		Amortized Cost				Gross Unrealized Holding Gains				Gross Unrealized Holding Losses				Estimated Fair Value				Amortized Cost				Gross Unrealized Holding Gains				Gross Unrealized Holding Losses				Estimated Fair Value
Money market funds		$	7,631,824			$	-			$	-			$	7,631,824			$	10,143,196			$	-			$	-			$	10,143,196
Corporate bonds			49,106,800				772,080				(216,834	)			49,662,046				53,308,105				1,570,195				(160,674	)			54,717,626
Total		$	56,738,624			$	772,080			$	(216,834	)		$	57,293,870			$	63,451,301			$	1,570,195			$	(160,674	)		$	64,860,822

Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table Text Block]

		Less Than 12 Months								12 Months or Greater								Total
		Estimated Fair Value				Gross Unrealized Holding Losses				Estimated Fair Value				Gross Unrealized Holding Losses				Estimated Fair Value				Gross Unrealized Holding Losses
As of December 31, 2021
Corporate bonds		$	10,167,905			$	(216,834	)		$	-			$	-			$	10,167,905			$	(216,834	)
Total		$	10,167,905			$	(216,834	)		$	-			$	-			$	10,167,905			$	(216,834	)
As of March 31, 2021
Corporate bonds		$	10,322,539			$	(160,674	)		$	-			$	-			$	10,322,539			$	(160,674	)
Total		$	10,322,539			$	(160,674	)		$	-			$	-			$	10,322,539			$	(160,674	)

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Tabular disclosure of fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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