Note 7 - Long-term Debt (Details Textual)	Mar. 31, 2019 USD ($)
East West Bank [Member]
Debt Instrument, Collateral Amount	$ 3,642,215
Capital Bank [Member]
Debt Instrument, Collateral Amount	3,116,687
Bank of America [Member]
Debt Instrument, Collateral Amount	$ 1,684,898