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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 |  |

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