Note 9 - Discontinued Operations - Current and Long-term Accrued Environmental Liabilities (Details) - USD ($) |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Current Accual | $ 677,000 | |
| Long-term Accrual | 248,000 | |
| Total | 925,000 | $ 900,000 |
| PFD [Member] | ||
| Current Accual | 75,000 | |
| Long-term Accrual | 60,000 | |
| Total | 135,000 | |
| PFM [Member] | ||
| Current Accual | ||
| Long-term Accrual | 15,000 | |
| Total | 15,000 | |
| PFSG [Member] | ||
| Current Accual | 602,000 | |
| Long-term Accrual | 173,000 | |
| Total | $ 775,000 |
| X | ||||||||||
- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable in twelve months or in the next operating cycle if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable after twelve months or beyond the next operating cycle if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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