Note 13 - Revenue by Product Group, by Significant Customer and by Geographic Region; Geographic Information (Details) - Revenues by Geographic Location (USD $)

3 Months Ended

12 Months Ended

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Note 13 - Revenue by Product Group, by Significant Customer and by Geographic Region; Geographic Information (Details) - Revenues by Geographic Location [Line Items]

Revenue (in Dollars)

$ 21,251,328

$ 17,754,438

$ 20,828,377

$ 15,247,011

$ 22,606,465

$ 14,766,611

$ 19,624,769

$ 14,360,660

$ 75,081,154

$ 71,358,505

$ 64,778,635

Geographic Concentration Risk [Member] | United States [Member] | Sales Revenue, Net [Member]

Note 13 - Revenue by Product Group, by Significant Customer and by Geographic Region; Geographic Information (Details) - Revenues by Geographic Location [Line Items]

Percentage of Total Revenue

78.00%

81.00%

75.00%

Geographic Concentration Risk [Member] | Europe [Member] | Sales Revenue, Net [Member]

Note 13 - Revenue by Product Group, by Significant Customer and by Geographic Region; Geographic Information (Details) - Revenues by Geographic Location [Line Items]

Percentage of Total Revenue

10.00%

9.00%

17.00%

Geographic Concentration Risk [Member] | Other location [Member] | Sales Revenue, Net [Member]

Note 13 - Revenue by Product Group, by Significant Customer and by Geographic Region; Geographic Information (Details) - Revenues by Geographic Location [Line Items]

Percentage of Total Revenue

12.00%

10.00%

8.00%

Geographic Concentration Risk [Member] | Sales Revenue, Net [Member]

Note 13 - Revenue by Product Group, by Significant Customer and by Geographic Region; Geographic Information (Details) - Revenues by Geographic Location [Line Items]

Percentage of Total Revenue

100.00%

United States [Member]

Note 13 - Revenue by Product Group, by Significant Customer and by Geographic Region; Geographic Information (Details) - Revenues by Geographic Location [Line Items]

Revenue (in Dollars)

58,490,142

57,976,667

48,366,140

Europe [Member]

Note 13 - Revenue by Product Group, by Significant Customer and by Geographic Region; Geographic Information (Details) - Revenues by Geographic Location [Line Items]

Revenue (in Dollars)

7,411,568

6,218,890

10,988,664

Other location [Member]

Note 13 - Revenue by Product Group, by Significant Customer and by Geographic Region; Geographic Information (Details) - Revenues by Geographic Location [Line Items]

Revenue (in Dollars)

$ 9,179,444

$ 7,162,948

$ 5,423,831