Note 4 - Accounts Receivable, net (Tables)

3 Months Ended

Jun. 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:

	June 30, 2019			March 31, 2019
Government	$	1,212,550		$	1,951,729
Commercial		370,922			251,870
Less: Allowance for doubtful accounts		(7,500	)		(7,500	)
	$	1,575,972		$	2,196,099