Note 1 - Summary of Significant Interim Accounting Policies (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Amortization of Intangible Assets	$ 241,000	$ 241,000	$ 482,000	$ 541,000
Advertising Expense	19,000	38,000	30,000	59,000
Selling, General and Administrative Expense	8,088,000	8,490,000	17,002,000	17,396,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Period Increase (Decrease), Weighted Average Exercise Price (in Dollars per share)	$ 12.85	$ 11.97	$ 13.03	$ 11.96
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)	1,298,700		1,298,700
Share-based Compensation	37,000	36,000	712,000	824,000
Deferred Income Tax Expense (Benefit)			(241,000)	(496,000)
Grant Period	5 years		5 years
Director Grant Period	10 years		10 years
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options			404,000	504,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in Shares)			51,602
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	758,000		758,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	30,000	32,000	133,000	113,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)	$ 2.67	$ 2.56	$ 3.50	$ 2.92
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in Shares)			105,208
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value			55,000	5,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)			$ 3.59	$ 2.96
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	162,000		162,000
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted (in Shares)			65,572	127,144
Shipping, Handling and Transportation Costs [Member]
Selling, General and Administrative Expense	1,343,000	1,368,000	2,786,000	2,840,000
Outstanding Stock Awards [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in Shares)	308,000	525,000	259,000	529,000
Share-Based Compensation [Member]
Deferred Income Tax Expense (Benefit)	13,000	13,000	96,000	145,000
Exercise of Stock Options [Member]
Stock Repurchased During Period, Shares (in Shares)	8,403	8,491	8,403	8,491
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in Shares)	8,896	10,900	8,896	10,900
selling and administrative expense [Member]
Share-based Compensation			$ 712,000