Note B - Adoption of New Accounting Standards - Impact of New Standard on Consolidated Balance Sheet (Details) - USD ($)	Jun. 30, 2019	Apr. 01, 2019	Mar. 31, 2019
Operating lease assets	$ 7,655,000	$ 7,804,000
Other assets	465,000	496,000	465,000
Current portion of operating lease liabilities	1,065,000	1,162,000
Long-term operating lease liabilities	7,308,000	7,371,000
Other liabilities	$ 745,000	692,000	$ 1,390,000
Previous Accounting Guidance [Member]
Operating lease assets
Other assets		465,000
Current portion of operating lease liabilities
Long-term operating lease liabilities
Other liabilities		1,390,000
Adjustments for New Accounting Pronouncement [Member]
Operating lease assets		7,804,000
Other assets
Current portion of operating lease liabilities		1,162,000
Long-term operating lease liabilities		7,371,000
Other liabilities		(729,000)
Balance Sheet Reclassification Adjustments [Member]
Operating lease assets
Other assets		31,000
Current portion of operating lease liabilities
Long-term operating lease liabilities
Other liabilities		$ 31,000