Note O - Long-term Debt - Summary of Redemption Features (Details)	3 Months Ended
	Jun. 30, 2019
Debt Instrument, Redemption, Period One [Member]
Debt instrument, redemption price, percentage	103.313%
Debt Instrument, Redemption, Period Two [Member]
Debt instrument, redemption price, percentage	101.656%
Debt Instrument, Redemption, Period Three [Member]
Debt instrument, redemption price, percentage	100.00%