Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] |
| | Three Months Ended June 30, 2018 | | | | | | | | | | | | | | | | | | | | | | | | | Net revenues: | | | | | | | | | | | | | Net rental revenues | | $ | 14,052 | | | $ | 1,433 | | | $ | 15,485 | | Net revenues | | | 16,415 | | | | 1,433 | | | | 17,848 | | | | | | | | | | | | | | | Gross profit | | | 9,553 | | | | 1,433 | | | | 10,986 | | | | | | | | | | | | | | | Selling, general and administrative expenses: | | | | | | | | | | | | | Provision for doubtful accounts | | | - | | | | 1,433 | | | | 1,433 | | Total selling, general and administrative | | | 9,757 | | | | 1,433 | | | | 11,190 | |
| | Six Months Ended June 30, 2018 | | | | | | | | | | | | | | | | | | | | | | | | | Net revenues: | | | | | | | | | | | | | Net rental revenues | | $ | 28,473 | | | $ | 3,337 | | | $ | 31,810 | | Net revenues | | | 32,898 | | | | 3,337 | | | | 36,235 | | | | | | | | | | | | | | | Gross profit | | | 19,626 | | | | 3,337 | | | | 22,963 | | | | | | | | | | | | | | | Selling, general and administrative expenses: | | | | | | | | | | | | | Provision for doubtful accounts | | | - | | | | 3,337 | | | | 3,337 | | Total selling, general and administrative | | | 19,242 | | | | 3,337 | | | | 22,579 | |
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