Note 6 - 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	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2021	Sep. 30, 2017	Sep. 30, 2016	Mar. 31, 2021	Dec. 31, 2022	Mar. 31, 2020	Mar. 31, 2021	Apr. 14, 2017	Mar. 17, 2017	Dec. 31, 2016
Payments of Financing Costs							$ 5,559,000	$ 44,000
Repayments of Long-term Debt							174,378,000	12,355,000
Cash Paid for Extinguishment of Debt							5,522,000	150,000
Gain (Loss) on Extinguishment of Debt				$ (93,000)			(7,527,000)	(336,000)
Cash and Cash Equivalents, at Carrying Value				11,224,000	$ 21,883,000		11,224,000	$ 21,883,000							$ 21,228,000
The 2017 Senior Credit Facility [Member]
Proceeds from Long-term Lines of Credit		$ 176,828,000
Debt Instrument, Unamortized Discount		3,172,000		2,834,000			2,834,000
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			$ 90,000,000
Weighted Average Life of Senior Credit Facility							2 years
The 2017 Senior Credit Facility [Member] | Revolving Credit Facility [Member]
Long-term Line of Credit				0			$ 0
Line of Credit Facility, Maximum Borrowing Capacity			$ 15,000,000	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] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate			5.00%
The 2017 Senior Credit Facility [Member] | Revolving Credit Facility Loan [Member] | Alternate Base Rate [Member] | Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate			0.00%
The 2015 Senior Secured Credit Facilities Due 2018 [Member]
Repayments of Long-term Lines of Credit		88,135,000
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)
6.25% Convertible Notes Due 2018 [Member]
Debt Instrument, Face Amount													$ 83,956,000
Debt Instrument, Unamortized Discount				74,000			74,000								2,271,000
Convertible Notes Payable		$ 94,000,000		$ 10,044,000			$ 10,044,000								$ 94,000,000
Debt Instrument, Interest Rate, Stated Percentage		6.25%		6.25%			6.25%							6.25%	6.25%
Payments of Financing Costs		$ 197,000
Debt Issuance Costs, Net	$ 707,000
Gain (Loss) on Extinguishment of Debt							$ (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
Long-term Debt, Gross	83,956,000
Interest Payable, Current	2,420,000
Debt Instrument, Unamortized Premium, Current	3,148,000
Restricted Cash and Cash Equivalents	83,956,000			$ 10,044,000			$ 10,044,000
Cash and Cash Equivalents, at Carrying Value	$ 6,275,000