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Notes to Condensed Consolidated Financial Statements (Tables)
 6 Months Ended
Nov. 30, 2018
Inventory Disclosure [Abstract]  
Inventory
Inventory  November 30, 2018  May 31, 2018
Raw materials  $709,862   $726,852 
Work-in-process   10,806,618    9,990,225 
Finished goods   665,245    700,698 
Gross inventory   12,181,725    11,417,775 
Less allowance for obsolescence   100,000    100,000 
Net Inventory  $12,081,725   $11,317,775 
Impact of Adoption of Standards Related to Revenue Recognition
          

Balance Sheet

 

  Balance at May 31, 2018  Adjustments Due to ASU 2014-09  Balance at June 1, 2018
Assets               
Inventory  $11,317,775   $1,101,116   $12,418,891 
Costs and estimated earnings in excess of billings  $6,356,963    (326,509)  $6,030,454 
Liabilities               
Billings in excess of costs and estimated earnings  $2,043,002    (25,105)  $2,017,897 
Other accrued expenses  $1,412,502   $794,713   $2,207,215 
Equity               
Retained earnings  $26,959,080   $4,999   $26,964,079 
                
Revenue Impact on Financial Statements Balance Sheet
                        
  November 30, 2018
Balance Sheet  As Reported  Effect of Change Higher/(Lower)  Balances Without Adoption of ASU 2014-09
Assets         
Inventory  $12,081,725   $—     $12,081,725 
Costs and estimated earnings in excess of billings  $5,953,406   $—     $5,953,406 
Other current assets  $481,880   $—     $481,880 
Liabilities               
Other accrued expenses  $1,818,422   $—     $1,818,422 
Equity               
Retained earnings  $28,080,428   $—     $28,080,428 

 

                        
   For the Six Months ended November 30, 2018
Income Statement  As Reported  Effect of Change Higher/(Lower)  Balances Without Adoption of ASU 2014-09
Revenues         
Sales, net  $16,793,253   $1,096,117   $15,697,136 
Costs and Expenses               
Cost of goods sold  $12,337,646   $1,101,116   $11,236,530 
Provision for income taxes  $259,000   $—     $259,000 
Net income (loss)  $1,116,349   $(4,999)  $1,121,348 

 
Revenue Impact on Financial Statements Income Statement
                        
  For the Three Months ended November 30, 2018
Income Statement  As Reported  Effect of Change Higher/(Lower)  Balances Without Adoption of ASU 2014-09
Revenues         
Sales, net  $9,479,159   $1,022,674   $8,456,485 
Costs and Expenses               
Cost of goods sold  $7,329,815   $1,065,474   $6,264,341 
Provision for income taxes  $81,000   $(8,000)  $89,000 
Net income (loss)  $375,517   $(34,800)  $410,317