Note I - Equity-based Compensation - Stock Options, SARs and RSUs Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Sep. 30, 2018		Jun. 30, 2018
Outstanding (in shares)		2,107
Outstanding, weighted average exercise price (in dollars per share)		$ 4.55
Outstanding, weighted average remaining contractual term (Year)	[1]	4 years 29 days	[2]
Outstanding, aggregate value	[3]	$ 14,640	[2]
Options / SARs / RSUs cancelled/forfeited/expired (in shares)		(20)
Options / SARs / RSUs cancelled/forfeited/expired, weighted average exercise price (in dollars per share)		$ 5.33
Options / SARs exercised and RSUs vested (in shares)		(79)
Options / SARs exercised and RSUs vested, weighted average exercise price (in dollars per share)		$ 0.42
Outstanding (in shares)		2,015	[2]	2,107
Outstanding, weighted average exercise price (in dollars per share)		$ 4.68	[2]	$ 4.55
Exercisable (in shares)	[4]	817
Exercisable, weighted average exercise price (in dollars per share)	[4]	$ 8.83
Exercisable, weighted average remaining contractual term (Year)	[1],[4]	3 years 200 days
Exercisable, aggregate value	[3],[4]	$ 2,560
Restricted Stock Units (RSUs) [Member]
Non-option instruments granted (in shares)		7
Non-option instruments, weighted average exercise price (in dollars per share)

[1] Calculation of weighted average remaining contractual term does not include RSUs that were granted, which have indefinite contractual term.

[2] Due to the ceiling imposed on the stock appreciation right (SAR) grants, the outstanding amount above can be exercised for a maximum of 1,922 shares of the Companys common stock as of September 30, 2018. SAR grants made on or after January 1, 2012 are convertible for a maximum number of shares of the Companys common stock equal to 50% of the SARs subject to the grant.

[3] Calculation of aggregate intrinsic value is based on the share price of the Companys common stock on September 30, 2018 ($11.90 per share).

[4] Due to the ceiling imposed on the SAR grants, the exercisable amount above can be exercised for a maximum of 785 shares of the Companys common stock as of September 30, 2018.