Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating Activities:
Net income	$ 947	$ 346
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	39	33
Stock-based compensation	4	5
Penalties on dividends	6	12
Changes in operating assets and liabilities:
Accounts receivable	475	(282)
Inventories		15
Prepaid expenses and other assets	(94)	(92)
Operating lease, right-of-use asset	246
Accounts payable and accrued expenses	(307)	87
Deferred revenue	(529)	(330)
Net cash provided by (used in) operating activities	787	(206)
Investing Activities:
Purchases of property and equipment	(96)	(37)
Financing Activities:
Borrowings on loan from officer		100
Payments on loan to officer	(1,000)
Proceeds from stock options exercised	220	70
Payments of dividends	(597)
Reduction of finance lease liability	(15)	(18)
Net cash provided by (used in) financing activities	(1,392)	152
Net decrease in cash and cash equivalents	(701)	(91)
Cash and cash equivalents at beginning of period	1,652	224
Cash and cash equivalents at end of period	951	133
SUPPLEMENTAL DISCLOSURE OF NON CASH OPERATING AND FINANCING ACTIVITIES:
Preferred stock dividends accrued	34	36
Purchase of leased equipment per right-of-use finance lease		41
Initial recognition of operating lease, right-of-use asset	$ 1,744