Note J - Leases (Details Textual)	3 Months Ended
	Mar. 31, 2019
Lessee, Lease, Option to Extend, Maximum Term	5 years
Lessee, Lease, Option to Terminate, Term	1 year
Minimum [Member]
Lessee, Lease, Remaining Term of Contract	1 year
Maximum [Member]
Lessee, Lease, Remaining Term of Contract	7 years