Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Notes Receivable (Details Textual)

v3.8.0.1
Note 4 - Notes Receivable (Details Textual) - Milestone China [Member] - USD ($)
shares in Millions
1 Months Ended
Apr. 30, 2018
Jun. 30, 2017
Mar. 31, 2018
Dec. 31, 2017
May 31, 2017
Jun. 30, 2014
Equity Method Investment, Ownership Percentage           40.00%
Equity Method Investment, Deferred Gain on Sale   $ 1,400,000        
Equity Method Investments   $ 0 $ 0 $ 0   $ 1,000,000
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        
Sale of Variable Interest Entity's Shares [Member] | Subsequent Event [Member]            
Return Obligation, Amount Repaid $ 250,000          
Termination Agreement, Number of Shares Returned 1.4