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Note 2 - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2015
Notes Tables |
Schedule of Credit Losses for Financing Receivables, Current [Table Text Block] |
|  | Year Ended December 31, |
|  | 2015 |  |  | 2014 |
Allowance for doubtful accounts-beginning of year |  | $ | 2,170 |  |  | $ | 1,932 |
(Recovery of) provision for bad debt reserve |  |  | (433 | ) |  |  | 291 |
Write-off |  |  | (263 | ) |  |  | (53 | )
Allowance for doubtful accounts-end of year |  | $ | 1,474 |  |  | $ | 2,170 |
Schedules of Concentration of Risk, by Risk Factor [Table Text Block] |
|  |  |  | Total |  |  | % of Total |
Customer |  | Year |  | Revenue |  |  | Revenue |
Prologis Teterboro, LLC |  | 2015 |  | $ | 10,686,000 |  |  |  | 17.1% |

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