Note B - Adoption of New Accounting Standards (Details Textual) - USD ($)		Jun. 30, 2019	Apr. 01, 2019	Mar. 31, 2019
Operating Lease, Right-of-Use Asset		$ 7,655,000	$ 7,804,000
Operating Lease, Liability, Total	[1]	$ 8,373,000
Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset			7,804,000
Operating Lease, Liability, Total			$ 8,533,000

[1] The present value of minimum operating lease payments of $1,065,000 and $7,308,000 are included in "Current portion of operating lease liabilities" and "Long-term operating lease liabilities," respectively.