Note 12 - Condensed Consolidating Financial Statements (Details) - Condensed Consolidating Statements of Operations - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended
Jan. 21, 2014
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Condensed Income Statements, Captions [Line Items]          
Revenues   $ 90,953,000 $ 93,722,000 $ 185,019,000 $ 191,245,000
Costs of services   80,190,000 81,419,000 163,707,000 167,522,000
Gross margin   10,763,000 12,303,000 21,312,000 23,723,000
Operating costs and expense:          
General and administrative   6,067,000 4,967,000 11,329,000 9,921,000
Depreciation, amortization and accretion   1,374,000 1,576,000 2,632,000 3,137,000
Operating income   3,322,000 5,760,000 7,351,000 10,665,000
Other income (expense):          
Equity earnings (loss) in subsidiaries   0 0 0 0
Interest expense, net   (1,440,000) (772,000) (2,447,000) (1,557,000)
Offering costs $ (400,000) 0 0 0 (446,000)
Other, net   55,000 37,000 63,000 25,000
Net income before income tax expense   1,937,000 5,025,000 4,967,000 8,687,000
Income tax expense   78,000 96,000 282,000 241,000
Net income   1,859,000 4,929,000 4,685,000 8,446,000
Net income attributable to non-controlling interests   (77,000) 1,249,000 90,000 2,022,000
Net income attributable to controlling interests   1,936,000 3,680,000 4,595,000 6,424,000
Consolidation, Eliminations [Member]          
Condensed Income Statements, Captions [Line Items]          
Revenues   (2,490,000) (17,000) (3,737,000) (95,000)
Costs of services   (2,490,000) (17,000) (3,737,000) (95,000)
Gross margin   0 0 0 0
Operating costs and expense:          
General and administrative   0 0 0 0
Depreciation, amortization and accretion   0 0 0 0
Operating income   0 0 0 0
Other income (expense):          
Equity earnings (loss) in subsidiaries   (2,665,000) (5,101,000) (5,755,000) (8,999,000)
Interest expense, net   0 0 0 0
Offering costs     0   0
Other, net   0 0 0 0
Net income before income tax expense   (2,665,000) (5,101,000) (5,755,000) (8,999,000)
Income tax expense   0 0 0 0
Net income   (2,665,000) (5,101,000) (5,755,000) (8,999,000)
Net income attributable to non-controlling interests   (18,000) 0 15,000 0
Net income attributable to controlling interests   (2,647,000) (5,101,000) (5,770,000) (8,999,000)
Parent Company [Member] | Reportable Legal Entities [Member]          
Condensed Income Statements, Captions [Line Items]          
Revenues   0 0 0 0
Costs of services   0 0 0 0
Gross margin   0 0 0 0
Operating costs and expense:          
General and administrative   351,000 0 455,000 0
Depreciation, amortization and accretion   0 0 0 0
Operating income   (351,000) 0 (455,000) 0
Other income (expense):          
Equity earnings (loss) in subsidiaries   2,665,000 5,101,000 5,755,000 8,999,000
Interest expense, net   (216,000) (262,000) (474,000) (441,000)
Offering costs     0   (446,000)
Other, net   0 0 0 0
Net income before income tax expense   2,098,000 4,839,000 4,826,000 8,112,000
Income tax expense   0 0   0
Net income   2,098,000 4,839,000 4,826,000 8,112,000
Net income attributable to non-controlling interests   0 1,111,000 145,000 1,861,000
Net income attributable to controlling interests   2,098,000 3,728,000 4,681,000 6,251,000
Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]          
Condensed Income Statements, Captions [Line Items]          
Revenues   82,521,000 88,178,000 167,267,000 176,934,000
Costs of services   72,844,000 76,357,000 147,782,000 154,460,000
Gross margin   9,677,000 11,821,000 19,485,000 22,474,000
Operating costs and expense:          
General and administrative   4,722,000 4,500,000 9,413,000 9,065,000
Depreciation, amortization and accretion   1,223,000 1,524,000 2,436,000 3,032,000
Operating income   3,732,000 5,797,000 7,636,000 10,377,000
Other income (expense):          
Equity earnings (loss) in subsidiaries   0 0 0 0
Interest expense, net   (1,072,000) (479,000) (1,746,000) (1,055,000)
Offering costs     0   0
Other, net   47,000 37,000 53,000 25,000
Net income before income tax expense   2,707,000 5,355,000 5,943,000 9,347,000
Income tax expense   101,000 116,000 258,000 187,000
Net income   2,606,000 5,239,000 5,685,000 9,160,000
Net income attributable to non-controlling interests   (59,000) 138,000 (70,000) 161,000
Net income attributable to controlling interests   2,665,000 5,101,000 5,755,000 8,999,000
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]          
Condensed Income Statements, Captions [Line Items]          
Revenues   10,922,000 5,561,000 21,489,000 14,406,000
Costs of services   9,836,000 5,079,000 19,662,000 13,157,000
Gross margin   1,086,000 482,000 1,827,000 1,249,000
Operating costs and expense:          
General and administrative   994,000 467,000 1,461,000 856,000
Depreciation, amortization and accretion   151,000 52,000 196,000 105,000
Operating income   (59,000) (37,000) 170,000 288,000
Other income (expense):          
Equity earnings (loss) in subsidiaries   0 0 0 0
Interest expense, net   (152,000) (31,000) (227,000) (61,000)
Offering costs     0   0
Other, net   8,000 0 10,000 0
Net income before income tax expense   (203,000) (68,000) (47,000) 227,000
Income tax expense   (23,000) (20,000) 24,000 54,000
Net income   (180,000) (48,000) (71,000) 173,000
Net income attributable to non-controlling interests   0 0 0 0
Net income attributable to controlling interests   $ (180,000) $ (48,000) $ (71,000) $ 173,000