Note 10 - Long-term Obligations (Details Textual) - USD ($)							3 Months Ended		9 Months Ended		12 Months Ended				21 Months Ended	30 Months Ended	42 Months Ended
	Apr. 17, 2017	Mar. 28, 2017	Mar. 13, 2017	Jan. 29, 2016	Sep. 14, 2015	Feb. 02, 2015	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2021	Sep. 30, 2017	Mar. 31, 2021	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2022	Mar. 31, 2020	Mar. 31, 2021	Apr. 14, 2017	Mar. 17, 2017	May 10, 2011
Payments of Financing Costs												$ 5,559,000	$ 544,000	$ 4,901,000
Repayments of Long-term Debt												176,466,000	13,421,000	333,961,000
Cash Paid for Extinguishment of Debt												5,522,000	150,000	391,000
Gain (Loss) on Extinguishment of Debt												(7,527,000)	(336,000)	(4,878,000)
Cash and Cash Equivalents, at Carrying Value												4,354,000	21,228,000
Long-term Debt and Capital Lease Obligations, Including Current Maturities												185,989,000	179,599,000
Amortization of Debt Issuance Costs												6,616,000	2,214,000	3,960,000
Accretion Expense												2,763,000	2,370,000	4,641,000
Loss on Extinguishment of Debt [Member]
Amortization of Debt Issuance Costs												5,535,000	109,000	2,446,000
Accretion Expense												1,482,000	430,000	2,041,000
Capital Lease Obligations and Other Long-term Obligations [Member]
Long-term Debt and Capital Lease Obligations, Including Current Maturities												$ 3,154,000	$ 3,325,000
Debt, Weighted Average Interest Rate												9.41%	8.97%
The 2017 Senior Credit Facility [Member]
Proceeds from Long-term Lines of Credit		$ 176,828,000
Debt Instrument, Unamortized Discount		3,172,000										$ 2,668,000
Cash		9,030,000
Payments of Financing Costs		3,526,000
Debt Issuance Costs, Net		6,580,000
Debt Instrument Covenants, Minimum Borrowing												$ 90,000,000
Weighted Average Life of Senior Credit Facility												2 years
Secured Debt												$ 178,350,000
The 2017 Senior Credit Facility [Member] | Revolving Credit Facility [Member]
Long-term Line of Credit												0
Line of Credit Facility, Maximum Borrowing Capacity			$ 15,000,000									$ 15,000,000
The 2017 Senior Credit Facility [Member] | Term A-1 Facility [Member]
Debt Instrument, Face Amount			$ 120,000,000
Debt Instrument, Maturity Date			Mar. 13, 2022
The 2017 Senior Credit Facility [Member] | Term A-1 Facility [Member] | Scenario, Forecast [Member]
Debt Instrument, Periodic Payment, Principal									$ 4,000,000		$ 2,250,000					$ 1,500,000
The 2017 Senior Credit Facility [Member] | Term A-1 Facility [Member] | Minimum [Member]
Debt Instrument, London Interbank Offered Rate			1.00%
The 2017 Senior Credit Facility [Member] | Term A-1 Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate			5.00%
The 2017 Senior Credit Facility [Member] | Term A-2 Facility [Member]
Debt Instrument, Face Amount			$ 60,000,000
Debt Instrument, Maturity Date			Mar. 13, 2023
The 2017 Senior Credit Facility [Member] | Term A-2 Facility [Member] | Scenario, Forecast [Member]
Debt Instrument, Periodic Payment, Principal															$ 600,000		$ 150,000
The 2017 Senior Credit Facility [Member] | Term A-2 Facility [Member] | Minimum [Member]
Debt Instrument, London Interbank Offered Rate			1.00%
The 2017 Senior Credit Facility [Member] | Term A-2 Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate			7.00%
The 2017 Senior Credit Facility [Member] | Term A-1 Facility and Term A-2 Facility [Member] | Federal Funds Effective Swap Rate [Member]
Debt Instrument, Basis Spread on Variable Rate			0.50%
The 2017 Senior Credit Facility [Member] | Revolving Credit Facility Loan [Member] | Minimum [Member]
Debt Instrument, London Interbank Offered Rate			1.00%
The 2017 Senior Credit Facility [Member] | Revolving Credit Facility Loan [Member] | Maximum [Member]
Aggregate Leverage Ratio												2.75%
The 2017 Senior Credit Facility [Member] | Revolving Credit Facility Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate			5.00%
The 2015 Senior Secured Credit Facilities Due 2018 [Member]
Repayments of Long-term Lines of Credit		88,135,000
Debt Issuance Costs, Net					$ 3,907,000
Debt Instrument, Periodic Payment, Principal			$ 1,650,000
Secured Debt, Current													4,000,000
Secured Long-term Debt, Noncurrent													2,350,000
Repayments of Long-term Debt		86,750,000
Cash Paid for Extinguishment of Debt		1,385,000
Gain (Loss) on Extinguishment of Debt		(2,297,000)
Debt Agreement, Maximum Borrowing Capacity					100,000,000
Secured Debt					90,000,000								86,750,000
The 2015 Senior Secured Credit Facilities Due 2018 [Member] | First Lien Term Loan Facility Due January 2, 2018 [Member]
Line of Credit Facility, Maximum Borrowing Capacity					10,000,000
Debt Instrument, Periodic Payment, Principal							$ 250,000
Secured Debt					65,000,000
The 2015 Senior Secured Credit Facilities Due 2018 [Member] | First Lien Term Loan Facility Due January 2, 2018 [Member] | Minimum [Member]
Debt Instrument, London Interbank Offered Rate												1.00%
The 2015 Senior Secured Credit Facilities Due 2018 [Member] | First Lien Term Loan Facility Due January 2, 2018 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate												4.50%
The 2015 Senior Secured Credit Facilities Due 2018 [Member] | Second Lien Facility [Member]
Secured Debt					25,000,000
The 2015 Senior Secured Credit Facilities Due 2018 [Member] | First Lien Revolving Credit Facility Due January 2, 2018 [Member]
Debt Instrument, Periodic Payment, Principal												$ 1,000,000	750,000
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage												0.25%
The 2015 Senior Secured Credit Facilities Due 2018 [Member] | First Lien Revolving Credit Facility Due January 2, 2018 [Member] | Minimum [Member]
Debt Instrument, London Interbank Offered Rate												1.00%
The 2015 Senior Secured Credit Facilities Due 2018 [Member] | First Lien Revolving Credit Facility Due January 2, 2018 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate												4.50%
The 2015 Senior Secured Credit Facilities Due 2018 [Member] | Second Lien Term Loan Facility Due March 3, 2018 [Member] | Minimum [Member]
Debt Instrument, London Interbank Offered Rate												1.00%
The 2015 Senior Secured Credit Facilities Due 2018 [Member] | Second Lien Term Loan Facility Due March 3, 2018 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate												8.50%
6.25% Convertible Notes Due 2018 [Member]
Debt Instrument, Face Amount																		$ 83,956,000		$ 120,000,000
Debt Instrument, Unamortized Discount				$ 250,000								$ 18,000	2,271,000
Convertible Notes Payable		$ 94,000,000										$ 10,044,000	$ 94,000,000
Debt Instrument, Interest Rate, Stated Percentage		6.25%										6.25%	6.25%						6.25%
Payments of Financing Costs		$ 197,000
Debt Issuance Costs, Net	$ 707,000											$ 3,407,000
Gain (Loss) on Extinguishment of Debt				(336,000)				$ (938,000)				(5,230,000)
Debt Instrument Repurchase Amount Per Note																		1,037.50	$ 1,025
Debt Instrument, Repurchased, Face Amount Per Note																		$ 1,000	$ 1,000
Proceeds from Convertible Debt										$ 94,000,000
Repayments of Convertible Debt	90,231,000			10,053,000				10,572,000
Long-term Debt, Gross	83,956,000
Interest Payable, Current	2,420,000			303,000
Debt Instrument, Unamortized Premium, Current	3,148,000
Restricted Cash and Cash Equivalents	83,956,000											$ 10,044,000
Cash and Cash Equivalents, at Carrying Value	$ 6,275,000
Debt Instrument, Convertible, Number of Shares												97,266.8
Debt Instrument, Convertible, Conversion Principal Amount Per Note												$ 1,000,000
Debt Instrument, Convertible, Conversion Price												$ 10.28
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger												130.00%
Debt Instrument, Convertible, Threshold Trading Days												20
Debt Instrument, Convertible, Threshold Consecutive Trading Days												30
Debt Instrument, Convertible, Parity Value Conversion Condition Trading Period												5 days
Debt Instrument, Convertible, Parity Value Conversion Condition												98.00%
Debt Instrument, Repurchase of Principal Plus Accrued and Unpaid Interest, Percentage												100.00%
Fair Value Inputs, Discount Rate												8.61%
Debt Instrument, Convertible, Carrying Amount of Equity Component												$ 686,000	$ 6,416,000							8,500,000
Debt Instrument, Convertible, Carrying Amount of Equity Component, Tax Benefit																				$ 5,931,000
Debt Instrument, Repurchased Face Amount				10,000,000				$ 10,000,000
Debt Instrument, Repurchase Amount				$ 9,750,000
Long-term Debt and Capital Lease Obligations, Including Current Maturities												$ 3,154,000	$ 3,325,000
2010 Senior Credit Facility [Member]
Repayments of Long-term Debt					81,526,000	$ 240,472,000								$ 240,472,000
Gain (Loss) on Extinguishment of Debt					$ 1,312,000