Note 4 - Accounts Receivable, net (Tables)

6 Months Ended

Sep. 30, 2019

Receivables [Abstract]

Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]

The following table sets forth the components of accounts receivable:

	September 30, 2019			March 31,  2019
Government	$	1,072,508		$	1,951,729
Commercial		236,886			251,870
Less: Allowance for doubtful accounts		(7,500	)		(7,500	)
	$	1,301,894		$	2,196,099