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Note 9 - Commitments and Contingencies (Details Textual) - USD ($) |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2007 | Jun. 30, 2003 | Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Bonds and Letters of Credit Outstanding Amount |  |  | $ 8,435,000 |  |
Bonds Purchased |  |  | 7,000,000 |  |
Perma-Fix Northwest Richland, Inc [Member] | Standby Letter of Credit for New Bonding Mechanism [Member] |  |  |  |  |
Debt Instrument, Collateral Amount |  |  | 2,500,000 |  |
American International Group, Inc [Member] |  |  |  |  |
Period of Finite Risk Insurance Policy |  | 25 years |  |  |
Maximum Allowable Coverage of Insurance Policy |  |  | 39,000,000 |  |
Financial Assurance Coverage Amount under Insurance Policy |  |  | 29,473,000 |  |
Sinking Fund Related to Insurance Policy |  |  | 15,573,000 |  | $ 15,546,000
Interest Earned on Sinking Fund |  |  | 1,102,000 |  | 1,075,000
Interest Income, Other |  |  | $ 27,000 | $ 14,000 |
Insurers Obligation to Entity on Termination of Contract |  |  | 100.00% |  |
American International Group, Inc [Member] | Perma-Fix Northwest Richland, Inc [Member] |  |  |  |  |
Financial Assurance Coverage Amount under Insurance Policy |  |  | $ 7,973,000 |  |
Interest Income, Other |  |  | 8,000 | $ 2,000 |
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 |  |  | $ 249,000 |  | 241,000
Period of Finite Second Insurance Policy |  |  | 4 years |  |
American International Group, Inc [Member] | Perma-Fix Northwest Richland, Inc [Member] | Credit Facility Secured by a Bond [Member] |  |  |  |  |
Financial Assurance Coverage Amount Under a Bond |  |  | $ 7,000,000 |  |
American International Group, Inc [Member] | Perma-Fix Northwest Richland, Inc [Member] | Other Current Assets [Member] |  |  |  |  |
Sinking Fund Related to Second Insurance Policy |  |  | 5,949,000 |  |
American International Group, Inc [Member] | Perma-Fix Northwest Richland, Inc [Member] | Other Noncurrent Assets [Member] |  |  |  |  |
Sinking Fund Related to Second Insurance Policy |  |  | $ 5,949,000 |  | $ 5,941,000

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