Annual report pursuant to Section 13 and 15(d)

Note H - Investment in and Transactions with Unconsolidated Subsidiaries (Details Textual)

v3.19.1
Note H - Investment in and Transactions with Unconsolidated Subsidiaries (Details Textual)
1 Months Ended 5 Months Ended 12 Months Ended
Apr. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2014
USD ($)
Nov. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Proceeds from Sale of Variable Interest Entity Shares with Agreement to Repurchase         $ (250,000) $ 250,000
Income (Loss) from Equity Method Investments, Total         329,700 (120,510)
Milestone China [Member]            
Equity Method Investments     $ 1,000,000   0 0
Long-term Purchase Commitment, Minimum Quantity Required     772      
Equity Method Investment, Ownership Percentage     40.00%      
Financing Receivable, Net, Total         2,800,000  
Equity Method Investment, Deferred Gain on Sale   $ 1,400,000        
Revenue from Related Parties         900,000 2,071,000
Contract with Customer, Liability, Total         100,000 1,700,000
Capitalized Contract Cost, Net, Total         500,000 1,100,000
Account Receivables, Related Party, Monthly Payment       $ 200,000    
Accounts Receivable, Related Party, Balloon Payment to be Paid       $ 1,425,000    
Proceeds from Collection of Finance Receivables         $ 900,000  
Equity Method Investment, Deferred Intercompany Profit (Loss), Percentage         40.00%  
Income (Loss) from Equity Method Investments, Total         $ (329,700) 120,510
Cost-method Investments, Realized Losses         3,380,388 3,147,470
Inventory Adjustments, Total         1,250,000  
Milestone China [Member] | Accounts Receivable from Related Parties [Member]            
Equity Method Investment, Deferred Intercompany Profit (Loss)         $ 421,800 $ 751,500
Milestone China [Member] | Sale of Variable Interest Entity's Shares [Member]            
Equity Method Investment, Ownership Percentage   40.00%        
Option to Repurchase, Period   10 years        
Price for Shares of Variable Interest Entity Interest Sold   $ 1,400,000        
Proceeds from Sale of Variable Interest Entity Shares with Agreement to Repurchase   125,000        
Financing Receivable, Net, Total   1,275,000        
Note Receivable, Quarterly Installment Amount   125,000        
Option to Repurchase Variable Interest Entity Shares, Purchase Price   $ 1,400,000        
Option to Repurchase Variable Entity Shares at Specified Purchase Price, Period   2 years        
Equity Method Investment, Deferred Gain on Sale   $ 1,400,000        
Variable Interest Entity Ownership Percentage Sold   40.00%        
Notes Receivable, Reversal Amount $ 1,150,000          
Equity Method Investment, Reversal of Deferred Gain on Sale 1,400,000          
Termination Agreement, Gain (Loss) on Transaction 0          
Milestone China [Member] | Sale of Variable Interest Entity's Shares [Member] | Upon Exercise of Default Agreement [Member]            
Return Obligation, Amount $ 250,000