Note 14 - Variable Interest Entities ("VIE") and Transactions - Condensed Balance Sheet (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Current Assets	$ 33,010,734	$ 32,291,485
Property, plant and equipment, net	3,814,981	4,556,581
Total assets	38,760,834	39,984,038
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]
Current Assets	490,000	608,000
Property, plant and equipment, net	200,000	231,000
Other noncurrent assets	800,000	740,000
Total assets	1,490,000	1,579,000
Long-term Debt, Total	2,133,000	2,062,000
Total liabilities	$ 2,133,000	$ 2,062,000