Note 4 - Leases - Future Minimum Lease Payments (Details) - USD ($)	Dec. 31, 2019	Mar. 31, 2019
2020 (6 Months), finance leases	$ 185,871
2020 (6 Months), operating leases	17,547
2021, finance leases	528,443
2021, operating leases	71,548
2022, finance leases	544,296
2022, operating leases	73,939
2023, finance leases	560,625
2023, operating leases	38,101
2024, finance lease	577,444
2024, operating leases	3,926
Thereafter, finance leases	4,375,869
Thereafter, operating leases
Total undiscounted lease payments, finance leases	6,772,548
Total undiscounted lease payments, operating leases	205,061
Less: Amount representing interest, finance leases	(3,072,687)
Less: Amount representing interest, operating leases	(43,925)
Present value of minimum lease payments, finance leases	3,699,861
Present value of minimum lease payments, operating leases	161,136
Less: Current maturities of lease obligations, finance leases	(134,239)	$ (80,132)
Less: Current maturities of lease obligations, operating leases	(47,084)
Finance lease obligations, long term	3,565,622	3,646,540
Operating lease obligations, long term	$ 114,052