Note L - Stockholders' Equity - Schedule of Stockholders' Equity (Details) (Parentheticals) - $ / shares	3 Months Ended						9 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2020	Dec. 31, 2019
Cash dividends, per share (in dollars per share)	$ 0.02			$ 0.02			$ 0.06	$ 0.08
Retained Earnings [Member]
Cash dividends, per share (in dollars per share)	$ 0.02	$ 0.02	$ 0.02	$ 0.02	$ 0.02	$ 0.04