Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Jun. 30, 2017		Jun. 30, 2016
OPERATING ACTIVITIES
Net income	$ 3,297,615		$ 3,132,545
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	242,160		193,979
Deferred income taxes	(84,210)		(77,021)
Changes in operating assets and liabilities:
Accounts receivable	305,836		(407,840)
Inventories	109,553		18,783
Prepaid expenses and other assets	9,334		32,657
Accounts payable and accrued expenses	1,449,379		1,296,142
Deferred revenue	(107,100)
Net cash provided by operating activities	5,222,567		4,189,245
INVESTING ACTIVITIES
Purchases of fixed assets	(393,398)		412
Purchases of marketable securities	(3,809,610)		(4,983,543)
Cash used in investing activities	(4,203,008)		(4,983,131)
FINANCING ACTIVITIES
Payment of dividends to shareholders	(4,841,010)		(4,835,010)
Cash used in financing activities	(4,841,010)		(4,835,010)
Decrease in cash and cash equivalents	(3,821,451)		(5,628,896)
Cash and cash equivalents at beginning of period	8,199,364	[1]	7,534,593
Cash and cash equivalents at end of period	4,377,913		1,905,697
Supplemental disclosures of cash flow information:
Cash paid during the period for income taxes

[1] The March 31, 2017 Balance Sheet is derived from the audited financial statements contained in our Annual Report on Form 10-K for the fiscal year ended March 31, 2017.