Note 13 - Series A 8% Convertible Preferred Stock (Details) - USD ($)			9 Months Ended	12 Months Ended
	Oct. 05, 2018	Nov. 14, 2017	Dec. 31, 2018	Mar. 31, 2018
Note 13 - Series A 8% Convertible Preferred Stock (Details) [Line Items]
Stock Issued During Period, Shares, New Issues (in Shares)	166,667
Restricted Cash		$ 2,000,000
Preferred Stock, Par or Stated Value Per Share (in Dollars per share)			$ 0.10	$ 0.10
Series A Preferred Stock [Member]
Note 13 - Series A 8% Convertible Preferred Stock (Details) [Line Items]
Stock Issued During Period, Shares, New Issues (in Shares)		500,000
Proceeds from Issuance of Convertible Preferred Stock		$ 3,000,000
Preferred Stock, Par or Stated Value Per Share (in Dollars per share)		$ 6.00	$ 0.10	$ 0.10
Convertible Preferred Stock, Conversion Price (in Dollars per share)		$ 3.00
Preferred Stock, Dividend Rate, Percentage		8.00%	8.00%	8.00%
Preferred Stock, Conversion Basis		calculated on the basis of a 360 day year, consisting of twelve 30-day months, and shall accrue from the date of issuance of such shares of Series A Preferred, payable quarterly in cash
Dividends Payable, Current			$ 330,667
Debt Instrument, Convertible, Beneficial Conversion Feature			$ 16,200