Note 14 - Income Taxes - Components of Income Tax Expense (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Current tax expense/(benefit)	$ 490,215	$ 1,194
Deferred tax expense/(benefit)	985,220	1,037,940
Change in valuation allowance	(495,005)	(1,036,746)
Total tax expense/(benefit)	490,215	1,194
Bad Debt Allowance [Member]
Deferred tax expense/(benefit)	(6,651)	11,226
Operating Loss Carryforward [Member]
Deferred tax expense/(benefit)	483,302	1,060,942
Amortization of Intangibles [Member]
Deferred tax expense/(benefit)	18,354	5,482
Patent Litigation Settlement [Member]
Deferred tax expense/(benefit)	$ 0	$ (40,904)