Note O - Supplemental Cash Flow Information (Details Textual) - USD ($)		3 Months Ended		6 Months Ended	9 Months Ended
	Apr. 30, 2022	Dec. 31, 2022	Jun. 30, 2022	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Interest Paid, Excluding Capitalized Interest, Operating Activities					$ 1,316,000	$ 154,000
Income Taxes Paid, Net, Total					428,000	7,487,000
Proceeds from Income Tax Refunds						$ 423,000
Capital Expenditures Incurred but Not yet Paid					7,448,000
Transfer of Ownership of Life Insurance Policy		$ 31,000
Plateplus Inc. [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)	516,041			516,041
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable			$ 4,783,700	$ 4,783,700	$ 4,800,000