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Note 2 - Significant Accounting Policies (Details Textual)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Sales Returns and Allowances [Member]          
Estimated Non-Contracted Revenues Adjustment $ 82,000 $ (43,000) $ 224,000 $ (73,000)  
Money Market Funds [Member] | Alternative Investments, Fair Value Disclosure [Member}          
Cash Equivalents, at Carrying Value $ 6,500,000   $ 6,500,000   $ 10,400,000
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | UAMS [Member]          
Concentration Risk, Percentage 18.00% 72.00% 22.00% 75.00%  
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customer One [Member]          
Concentration Risk, Percentage 27.00% 0.00% 26.00% 0.00%  
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customer Two [Member]          
Concentration Risk, Percentage 12.00% 5.00% 12.00% 5.00%  
Sales Revenue, Net [Member] | Customer Concentration Risk [Member]          
Number of Major Customers 3   3    
Accounts Receivable [Member] | Customer Concentration Risk [Member] | UAMS [Member]          
Concentration Risk, Percentage     9.00%   19.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer One [Member]          
Concentration Risk, Percentage     0.00%   0.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer Two [Member]          
Concentration Risk, Percentage     0.00%   0.00%
Supplier Concentration Risk [Member]          
Number of Major Suppliers     1    
Accounts Receivable, Net, Current $ 658,000   $ 658,000   $ 394,000
Contractual Allowance 2,700,000   2,700,000   2,100,000
Provision for Doubtful Accounts 0 $ 4,000 2,000 $ 28,000  
Allowance for Doubtful Accounts Receivable $ 0   $ 0   $ 0