Annual report pursuant to Section 13 and 15(d)

Note 2 - Summary of Significant Accounting Policies (Details Textual)

v3.3.1.900
Note 2 - Summary of Significant Accounting Policies (Details Textual)
 12 Months Ended 24 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]      
Concentration Risk, Percentage 16.20% 13.80%  
Customer Concentration Risk [Member] | Accounts Receivable [Member]      
Number of Major Customers 1 1  
Customer Concentration Risk [Member] | Sales Revenue, Services, Net [Member] | Federal Government [Member]      
Revenues $ 36,105,000 $ 34,780,000  
Concentration Risk, Percentage 57.90% 60.90%  
Customer Concentration Risk [Member] | Sales Revenue, Services, Net [Member]      
Number of Major Customers 1    
Treatment [Member] | Federal Government [Member]      
Revenues $ 30,130,000   $ 29,786,000
Treatment [Member]      
Goodwill, Impairment Loss 0 $ 0  
Research and Development Expense 179,000 437,000  
Medical [Member]      
Research and Development Expense 2,114,000 759,000  
Workers Compensation [Member]      
Escrow Deposit $ 35,000   35,000
Building and Building Improvements [Member] | Minimum [Member]      
Property, Plant and Equipment, Useful Life 10 years    
Building and Building Improvements [Member] | Maximum [Member]      
Property, Plant and Equipment, Useful Life 40 years    
Furniture and Fixtures [Member] | Minimum [Member]      
Property, Plant and Equipment, Useful Life 3 years    
Furniture and Fixtures [Member] | Maximum [Member]      
Property, Plant and Equipment, Useful Life 7 years    
PCB Permit [Member]      
Number of Definite-lived Permits 1    
Finite-Lived Intangible Assets, Net $ 172,000 227,000 172,000
Federal Government [Member]      
Revenues 36,105,000   34,780,000
Reclassification from Current Deferred Tax Assets to Noncurrent Deferred Tax Assets [Member] | December 31, 2014 [Member]      
Prior Period Reclassification Adjustment 385,000    
Reclassification from Noncurrent Deferred Tax Assets to Noncurrent Deferred Tax Liabilities [Member] | December 31, 2014 [Member]      
Prior Period Reclassification Adjustment 385,000    
Self Insurance Reserve, Current $ 0 397,000 0
Goodwill, Impairment Loss 380,000  
Percentage of Reserves for Doubtful Accounts Receivable 100.00%    
Contract Receivable Retainage $ 229,000 11,000 229,000
Depreciation 3,246,000 3,602,000  
Finite-Lived Intangible Assets, Net 2,238 2,662 $ 2,238
Research and Development Expense 2,302,000 1,315,000  
Self Insurance Expenses for Continuing Operations 868,000 $ 2,697,000  
Monthly Health Insurance Premium $ 220,000