Note 1 - Summary of Significant Accounting Policies (Detail) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2003
Advertising Expense (in Dollars)									$ 51,000	$ 84,000
Shipping, Handling and Transportation Costs (in Dollars)									5,458,000	5,721,000
Amortization of Intangible Assets (in Dollars)									964,000	1,023,000
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months (in Dollars)	146,000								146,000
Finite-Lived Intangible Assets, Amortization Expense, Year Two (in Dollars)	146,000								146,000
Finite-Lived Intangible Assets, Amortization Expense, Year Three (in Dollars)	146,000								146,000
Finite-Lived Intangible Assets, Amortization Expense, Year Four (in Dollars)	121,000								121,000
Impairment of Intangible Assets (Excluding Goodwill) (in Dollars)	1,226,000								1,226,000
Pension Plan, Prior Service Costs, Amortization Term	20 years								20 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)											2,500,000
Number of Reportable Segments									2
Accounts Receivable, Net, Current (in Dollars)	16,655,000				15,942,000				16,655,000	15,942,000
Revenue, Net (in Dollars)	31,044,000	30,599,000	29,335,000	28,508,000	27,238,000	30,731,000	27,505,000	26,899,000
Other Receivables (in Dollars)	2,995,000				3,745,000				2,995,000	3,745,000
Comprehensive Income Presentation, Number of Statements, Continuous	1								1
Comprehensive Income Presentation, Number of Statements, Consecutive	2								2
Largest [Member] | Sales [Member] | Customer Concentration Risk [Member]
Concentration Risk, Percentage									7.00%	6.20%
Largest [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Concentration Risk, Percentage										14.90%
Concentration Risk, Number of Customers										1
Largest [Member] | Customer Concentration Risk [Member]
Accounts Receivable, Net, Current (in Dollars)					2,369,000					2,369,000
Revenue, Net (in Dollars)									8,412,000	6,963,000
Other Receivables (in Dollars)	2,966,000				3,722,000				2,966,000	3,722,000
Five Largest [Member] | Sales [Member] | Customer Concentration Risk [Member]
Concentration Risk, Percentage									26.70%	23.10%
Concentration Risk, Number of Customers									5	5
Five Largest [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Concentration Risk, Percentage									29.60%	36.40%
Concentration Risk, Number of Customers									5	5
Five Largest [Member] | Customer Concentration Risk [Member]
Accounts Receivable, Net, Current (in Dollars)	4,930,000				5,800,000				4,930,000	5,800,000
Revenue, Net (in Dollars)									$ 31,961,000	$ 25,987,000
Building [Member] | Maximum [Member]
Property, Plant and Equipment, Depreciation, Straight-line Percentage	5.00%								5.00%
Building [Member] | Minimum [Member]
Property, Plant and Equipment, Depreciation, Straight-line Percentage	2.50%								2.50%
Building Improvements [Member] | Maximum [Member]
Property, Plant and Equipment, Depreciation, Straight-line Percentage	20.00%								20.00%
Building Improvements [Member] | Minimum [Member]
Property, Plant and Equipment, Depreciation, Straight-line Percentage	2.50%								2.50%
Machinery, Equipment and Fixtures [Member] | Maximum [Member]
Property, Plant and Equipment, Depreciation, Straight-line Percentage	33.33%								33.33%
Machinery, Equipment and Fixtures [Member] | Minimum [Member]
Property, Plant and Equipment, Depreciation, Straight-line Percentage	10.00%								10.00%
Transportation Equipment [Member] | Maximum [Member]
Property, Plant and Equipment, Depreciation, Straight-line Percentage	33.33%								33.33%
Transportation Equipment [Member] | Minimum [Member]
Property, Plant and Equipment, Depreciation, Straight-line Percentage	20.00%								20.00%
2003 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)	1,284,675								1,284,675
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Minimum [Member]
Concentration Risk, Percentage									10.00%	10.00%
Supplier Concentration Risk [Member] | Central America [Member]
Concentration Risk, Percentage									48.00%	52.00%
Maximum [Member]
Cash and Cash Equivalents, Term	3 months								3 months