Annual report pursuant to Section 13 and 15(d)

Note 20 - Income Taxes (Details Textual)

v3.8.0.1
Note 20 - Income Taxes (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Deferred Tax Assets, Gross $ 39,708,697 $ 79,102,014  
Revaluation of Deferred Tax Asset, Decrease 26,400,000    
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount (26,400,000)    
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax 1,229,979  
Cardiosonix [Member] | Subsidiaries [Member]      
Net Income (Loss) Attributable to Parent (5,000) (13,000) $ (11,000)
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]      
Operating Loss Carryforwards 131,771,930 193,300,000  
Operating LossCarryforwardsStockBasedCompensation   15,300,000  
Net Operating Loss Carryforwards Expired in Period 0 0  
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Research Tax Credit Carryforward [Member]      
Tax Credit Carryforward, Amount 9,654,826 9,400,000  
State and Local Jurisdiction [Member]      
Operating Loss Carryforwards $ 20,400,000 28,200,000  
State and Local Jurisdiction [Member] | Earliest Tax Year [Member]      
Operating Loss Carryforwards, Expiration Date Dec. 31, 2032    
Foreign Tax Authority [Member] | Israel Tax Authority [Member] | Cardiosonix [Member] | Subsidiaries [Member]      
Operating Loss Carryforwards   $ 7,700,000  
Other Noncurrent Assets [Member]      
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax $ 1,200,000