Note 1 - Summary of Significant Interim Accounting Policies (Details) (USD $)	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended			1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 General and Administrative Expense [Member]	Sep. 30, 2013 General and Administrative Expense [Member]	Sep. 30, 2014 General and Administrative Expense [Member]	Sep. 30, 2013 General and Administrative Expense [Member]	Sep. 30, 2014 Outside Directors [Member] Employee Stock Option [Member]	Sep. 30, 2014 Stock Compensation Plan [Member]	Sep. 30, 2013 Stock Compensation Plan [Member]	Sep. 30, 2014 Stock Compensation Plan [Member]	Sep. 30, 2013 Stock Compensation Plan [Member]	Sep. 30, 2014 Common Stock [Member]	Feb. 28, 2014 Restricted Stock [Member]	Sep. 30, 2014 Stock Appreciation Rights (SARs) [Member]	Sep. 30, 2013 Stock Appreciation Rights (SARs) [Member]	Sep. 30, 2014 Stock Appreciation Rights (SARs) [Member]	Sep. 30, 2013 Stock Appreciation Rights (SARs) [Member]	Jul. 31, 2013 Interest Rate Swap [Member]
Note 1 - Summary of Significant Interim Accounting Policies (Details) [Line Items]
Amortization of Intangible Assets	$ 516,000	$ 504,000	$ 1,549,000	$ 577,000
Advertising Expense	28,000	11,000	92,000	66,000
Shipping, Handling and Transportation Costs	2,418,000	2,035,000	6,791,000	4,792,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in Shares)										59,000	234,000	23,000	297,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Weight-average Exercise Price (in Dollars per share)										$ 20.75	$ 12.99	$ 20.06	$ 12.75
Derivative, Fixed Interest Rate																				2.53%
Number of Reportable Segments			2
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)	2,500,000		2,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)	2,183,431		2,183,431
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)															50,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period															3 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period															3 years
Allocated Share-based Compensation Expense					384,000	170,000	1,338,000	789,000
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	22,000	0	178,000	72,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	572,000		572,000
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period			5 years						10 years
Company Stock Received, in Lieu of Cash, Stock Options Exercised (in Shares)			10,128
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in Shares)			148,109											20,408		22,646	0	34,085	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	4,992,000		4,992,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 692,000	$ 52,000	$ 977,000	$ 92,000												$ 199,000		$ 275,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)	$ 5.48	$ 3.19	$ 4.52	$ 3.01														$ 4.04	$ 2.97
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted (in Shares)																		68,691	59,716