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Note O - Supplemental Cash Flow Information (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Sep. 30, 2022
Apr. 30, 2022
Jun. 30, 2022
Sep. 30, 2022
Sep. 30, 2021
Mar. 31, 2022
Interest Paid, Excluding Capitalized Interest, Operating Activities       $ 557,000 $ 96,000  
Income Taxes Paid, Net, Total       400,000 $ 5,645,000  
Construction in Progress, Gross $ 22,035,059     $ 22,035,059   $ 15,925,306
Capital Expenditures Incurred but Not yet Paid $ 8,200,233          
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   $ 4,800,000 $ 4,783,700 $ 4,783,700