CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)			3 Months Ended		12 Months Ended
	Feb. 27, 2019	Jan. 06, 2017	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Feb. 28, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss			$ (1,922,000)	$ (5,454,000)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization			19,620,000	17,856,000
Amortization of operating lease right-of-use assets			16,000,000	0
Equity in earnings of joint ventures			(1,873,000)	(2,977,000)
Distributions from joint ventures			0	2,821,000
Amortization deferred financing costs and loan discount			975,000	974,000
Loss (gain) on sale and disposal of equipment			971,000	(1,936,000)
Stock-based compensation			4,538,000	3,745,000
Noncash items included in cost of operations			(559,000)	0
Change in fair value of contingent consideration			(639,000)	0
Changes in operating assets and liabilities, net of assets acquired and liabilities assumed in purchase transactions:
Accounts receivable			(9,486,000)	(6,132,000)
Other current assets			(1,184,000)	1,003,000
Other assets			1,254,000	(2,715,000)
Deferred taxes			(1,481,000)	(2,759,000)
Operating lease liability			(15,863,000)
Deferred rent			0	1,302,000
Deferred revenue			(440,000)	105,000
Accounts payable, accrued expenses and other			16,989,000	18,480,000
Net cash provided by operating activities			26,900,000	24,313,000
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of imaging facilities			(3,000,000)	(5,819,000)
Equity investments at fair value			(143,000)	(2,200,000)
Purchase of property and equipment			(32,940,000)	(23,946,000)
Proceeds from sale of equipment			756,000	2,116,000
Proceeds from the sale of equity interests in a joint venture			132,000
Proceeds from the sale of equity interests in a joint venture				0
Net cash used in investing activities			(35,195,000)	(29,849,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Principal payments on notes and leases payable			(1,713,000)	(1,736,000)
Payments on Term Loan Debt			(9,020,000)	(8,270,000)
Distributions paid to noncontrolling interests			0	(759,000)
Proceeds from sale of noncontrolling interest			5,275,000	0
Contribution from noncontrolling partner			750,000	0
Proceeds from revolving credit facility			144,900,000	0
Payments on revolving credit facility			(131,900,000)	0
Proceeds from issuance of common stock upon exercise of options			50,000	0
Net cash provided by (used in) financing activities			8,342,000	(10,765,000)
EFFECT OF EXCHANGE RATE CHANGES ON CASH			(8,000)	22,000
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS			39,000	(16,279,000)
CASH AND CASH EQUIVALENTS, beginning of period			10,389,000	51,322,000	$ 51,322,000
CASH AND CASH EQUIVALENTS, end of period			10,428,000	35,043,000	10,389,000
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid during the period for interest			10,296,000	9,050,000
Equipment acquired and leasehold improvements			32,600,000	36,100,000
Capital lease debt			0	$ 4,000,000
Investment in joint venture, ScriptSender, LLC		$ 3,000,000			$ 268,000
Ventura County Imaging Group, LLC
Fixed assets acquired			$ 4,300,000
Hudson Valley Radiology Associates
Equity interest issued, value assigned						$ 6,000,000
Variable Interest Entity, Not Primary Beneficiary
Shares issues (in shares)	440,207
Variable Interest Entity, Not Primary Beneficiary | Hudson Valley Radiology Associates
Equity interest issued, value assigned	$ 6,000,000