| Unaudited Consolidated Statements of Income [Abstract] | |
| Net revenues | 49.92M |
| Cost of sales | 35.94M |
| Gross profit | 13.98M |
| Selling, general and administrative expense | 9.29M |
| Equity loss from non-consolidated subsidiary | 79K |
| Operating income | 4.6M |
| Other income (expense): | |
| Interest expense, net | -846K |
| Other (expense) income, net | 734K |
| Total other income (expense), net | -112K |
| Income before income taxes and noncontrolling interests | 4.49M |
| Income taxes | 2M |
| Net income | 2.49M |
| Net income attributable to noncontrolling interests | -304K |
| Net income attributable to NTS | 2.19M |
| Net income attributable to NTS per common share: | |
| Basic (in dollars per share) | 0.19 |
| Diluted earnings per common share | |
| Diluted (in dollars per share) | 0.18 |
| Weighted average common shares outstanding - basic (in shares) | 11.38M |
| Dilutive effect of stock options, nonvested shares and warrants (in shares) | 610K |
| Weighted average common shares outstanding - diluted (in shares) | 11.99M |
| Cash dividends per common share | |