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Note 8 - Commitments and Contingencies (Details Textual) - USD ($) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 60 Months Ended
--- | --- | --- | --- | --- | ---
Aug. 31, 2007 | Jun. 30, 2003 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
American International Group, Inc [Member] | Other Noncurrent Assets [Member] | Perma-Fix Northwest Richland, Inc [Member] |  |  |  |  |  |  |
Sinking Fund Related to Second Insurance Policy |  |  | $ 5,927,000 |  | $ 5,927,000 |  |
American International Group, Inc [Member] | Other Noncurrent Assets [Member] |  |  |  |  |  |  |
Sinking Fund Related to Insurance Policy |  |  | 15,498,000 |  | 15,498,000 |  |
American International Group, Inc [Member] | Perma-Fix Northwest Richland, Inc [Member] | Minimum [Member] |  |  |  |  |  |  |
Renewal Fee for Additional Year under Second Insurance Policy |  |  |  |  |  |  | $ 41,000
American International Group, Inc [Member] | Perma-Fix Northwest Richland, Inc [Member] | Maximum [Member] |  |  |  |  |  |  |
Renewal Fee for Additional Year under Second Insurance Policy |  |  |  |  |  |  | $ 46,000
American International Group, Inc [Member] | Perma-Fix Northwest Richland, Inc [Member] |  |  |  |  |  |  |
Interest Income, Other |  |  | 5,000 | $ 2,000 | 7,000 | $ 3,000 |
Financial Assurance Coverage Amount under Second Insurance Policy | $ 7,800,000 |  |  |  |  |  |
Annual Growth Rate of Financial Assurance Coverage Amount Under Second Insurance Policy | 1.50% |  |  |  |  |  |
Maximum Financial Assurance Coverage Amount Under Second Insurance Policy | $ 8,200,000 |  |  |  |  |  |
Interest Earned on Sinking Fund under Second Insurance Policy |  |  | 227,000 |  | $ 227,000 |  |
Period of Finite Second Insurance Policy |  |  |  |  | 4 years |  |
American International Group, Inc [Member] |  |  |  |  |  |  |
Period of Finite Risk Insurance Policy |  | 25 years |  |  |  |  |
Maximum Allowable Coverage of Insurance Policy |  |  | 39,000,000 |  | $ 39,000,000 |  |
Financial Assurance Coverage Amount under Insurance Policy |  |  | 38,874,000 |  | 38,874,000 |  |
Interest Earned on Sinking Fund |  |  | 1,027,000 |  | 1,027,000 |  |
Interest Income, Other |  |  | $ 24,000 | $ 6,000 | 38,000 | $ 14,000 |
Insurers Obligation to Entity on Termination of Contract |  |  |  |  |  |  | 100.00%
Bonds and Letters of Credit Outstanding Amount |  |  |  |  | $ 1,514,000 |  |

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