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Note 6 - Investment in and Transactions With Equity Investees (Details Textual)
¥ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Oct. 08, 2021
USD ($)
Oct. 08, 2021
CNY (¥)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2021
USD ($)
Jun. 30, 2014
USD ($)
Income (Loss) from Equity Method Investments     $ 0 $ (95,857) $ 0 $ (94,556)      
Milestone China [Member]                  
Equity Method Investments                 $ 1,000,000
Equity Method Investment, Ownership Percentage                 40.00%
Financing Receivable, after Allowance for Credit Loss, Total             $ 2,800,000    
Proceeds from Collection of Finance Receivables             $ 950,000    
Contract with Customer, Liability, Total     270,000   270,000     $ 89,000  
Income (Loss) from Equity Method Investments     (0) (95,000) (0) (94,000)      
Milestone China [Member] | Accounts Receivable from Related Parties [Member]                  
Equity Method Investment, Deferred Intercompany Profit (Loss)     0   0     $ 0  
Milestone China [Member] | Instruments [Member]                  
Revenue from Related Parties     $ 0 $ 525,000 $ 370,000 $ 1,000,000.0      
Milestone Beijing [Member] | Milestone China [Member]                  
Equity Method Investment, Ownership Percentage                 75.00%
Anhui [Member]                  
Equity Method Investment, Ownership Percentage               28.40%  
Anhui [Member] | Milestone China [Member] | Chief Executive Officer [Member]                  
Equity Method Investment, Ownership Percentage 28.40% 28.40%              
Proceeds from Sale of Equity Method Investments $ 440,351 ¥ 2,840