Note J - Stockholders' Equity - Schedule of Stockholders' Equity (Details) (Parentheticals) - $ / shares	3 Months Ended						9 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2019	Dec. 31, 2018
Cash dividends, per share (in dollars per share)	$ 0.02			$ 0.06			$ 0.08	$ 0.15
Retained Earnings [Member]
Cash dividends, per share (in dollars per share)		$ 0.02	$ 0.04		$ 0.06	$ 0.03