Note 7 - Credit Facilities and Long-Term Debt (Detail) (USD $) In Thousands, unless otherwise specified							9 Months Ended			9 Months Ended				9 Months Ended			9 Months Ended
	Dec. 31, 2012 Due March 31, 2013 [Member] "New Credit Agreement" [Member] Secured Term Loan [Member]	Dec. 31, 2012 Due June 30, 2013 [Member] "New Credit Agreement" [Member] Secured Term Loan [Member]	Dec. 31, 2012 Due September 30, 2013 [Member] "New Credit Agreement" [Member] Secured Term Loan [Member]	Dec. 31, 2012 Due December 31, 2013 [Member] "New Credit Agreement" [Member] Secured Term Loan [Member]	Dec. 31, 2012 Due March 31, 2014 [Member] "New Credit Agreement" [Member] Secured Term Loan [Member]	Dec. 31, 2012 Due June 30, 2014 [Member] "New Credit Agreement" [Member] Secured Term Loan [Member]	Dec. 31, 2012 "Prior Credit Agreement" [Member] Secured Term Loan [Member]	Dec. 31, 2011 "Prior Credit Agreement" [Member] Secured Term Loan [Member]	Aug. 27, 2010 "Prior Credit Agreement" [Member] Secured Term Loan [Member]	Dec. 31, 2012 "Prior Credit Agreement" [Member] Revolving Credit Facility [Member]	Dec. 31, 2011 "Prior Credit Agreement" [Member] Revolving Credit Facility [Member]	Aug. 27, 2010 "Prior Credit Agreement" [Member] Revolving Credit Facility [Member]	Aug. 27, 2010 "Prior Credit Agreement" [Member]	Dec. 31, 2012 "New Credit Agreement" [Member] Secured Term Loan [Member]	Dec. 31, 2011 "New Credit Agreement" [Member] Secured Term Loan [Member]	Jun. 07, 2012 "New Credit Agreement" [Member] Secured Term Loan [Member]	Dec. 31, 2012 "New Credit Agreement" [Member] Revolving Credit Facility [Member]	Dec. 31, 2011 "New Credit Agreement" [Member] Revolving Credit Facility [Member]	Jun. 07, 2012 "New Credit Agreement" [Member] Revolving Credit Facility [Member]	Dec. 31, 2012 "New Credit Agreement" [Member] On a Rolling Four Fiscal Quarter Basis [Member]	Dec. 31, 2012 "New Credit Agreement" [Member] For Fiscal Quarter Ending June 30, 2012 [Member]	Dec. 31, 2012 "New Credit Agreement" [Member] For The Two Consecutive Fiscal Quarter Period Ending September 30, 2012 [Member]	Dec. 31, 2012 "New Credit Agreement" [Member] For The Three Consecutive Fiscal Quarter Period Ending December 31, 2012 [Member]	Dec. 31, 2012 "New Credit Agreement" [Member] For The Four Consecutive Fiscal Quarter Period Ending March 31, 2013 [Member]	Dec. 31, 2012 "New Credit Agreement" [Member] For The Four Consecutive Fiscal Quarter Period Ending June 30, 2013 [Member]	Dec. 31, 2012 "New Credit Agreement" [Member]	Jun. 07, 2012 "New Credit Agreement" [Member]	Dec. 31, 2012 "Prior and New Credit Agreements" [Member] Secured Term Loan [Member]	Dec. 31, 2012 "Prior and New Credit Agreements" [Member] Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity									$ 80,000			$ 30,000	$ 110,000			$ 51,000			$ 25,000								$ 76,000
Amount Of Installment For Principal Repayments Of Term Loan	1,000	2,000	2,000	2,250	2,250	39,500
Debt Instrument, Basis Spread on Variable Rate																												3.50%	4.00%
Debt Average InterestRate							3.51%	3.51%		5.52%	5.52%			4.13%	4.13%		4.69%	4.69%
Financial Covenant, Maximum Annual Capital Expenditures																										4,000
Financial Covenant, Minimum Fixed Charge Coverage Ratio																				1.00
Financial Covenant, Minimum Earnings Before Interest, Taxes, Depreciation and Amortization																					3,000	7,500	13,750	18,000	21,000
Line of Credit Facility, Remaining Borrowing Capacity																	10,712
Line of Credit Facility, Amount Outstanding																	$ 5,300