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Note 8 - Balance Sheet Details (Tables) | 6 Months Ended
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Jun. 30, 2019
Notes Tables |
Schedule of Inventory, Current [Table Text Block] |
|  | June 30, 2019 |  |  | December 31, 2018 |
Raw material |  | $ | 340,716 |  |  | $ | 348,980 |
Work-in-process |  |  | 7,453 |  |  |  | 6,971 |
Finished goods |  |  | 222,158 |  |  |  | 188,799 |
Total |  | $ | 570,327 |  |  | $ | 544,750 |
Property, Plant and Equipment [Table Text Block] |
|  | June 30, 2019 |  |  | December 31, 2018 |
Land and improvements |  | $ | 17,941 |  |  | $ | 15,975 |
Buildings and improvements |  |  | 174,901 |  |  |  | 163,161 |
Machinery and equipment |  |  | 109,537 |  |  |  | 103,726 |
Dies and tools |  |  | 20,135 |  |  |  | 28,198 |
Vehicles |  |  | 3,321 |  |  |  | 2,070 |
Office equipment and systems |  |  | 89,007 |  |  |  | 82,638 |
Leasehold improvements |  |  | 3,809 |  |  |  | 2,137 |
Construction in progress |  |  | 28,339 |  |  |  | 26,543 |
Gross property and equipment |  |  | 446,990 |  |  |  | 424,448 |
Accumulated depreciation |  |  | (146,195 | ) |  |  | (145,519 | )
Total |  | $ | 300,795 |  |  | $ | 278,929 |

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