Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Investment in Limited Liability Company (Details Textual)

v3.10.0.1
Note 4 - Investment in Limited Liability Company (Details Textual)
3 Months Ended 6 Months Ended
Aug. 08, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Income (Loss) from Equity Method Investments, Total     $ (407,000)
InControl Medical [Member]        
Equity Method Investment, Ownership Percentage   11.00% 11.00%  
Income (Loss) from Equity Method Investments, Total   $ 158,000 $ 407,000  
InControl Medical [Member] | Distribution Agreement [Member]        
Unrecorded Unconditional Purchase Obligation, Period Quantity Purchased     2,700  
Payments for Purchase of Products   $ 63,000 $ 143,000  
InControl Medical [Member] | Membership Unit Subscription Agreement [Member]        
Payments to Acquire Equity Method Investments $ 2,500,000   $ 2,500,000